So they sent for me to find out why Mike wanted to give away ten million billion Authority Scrip dollars, and fix it before Mike overpaid somebody a mere ten thousand.

I took it, time plus bonus, but did not go to circuitry where fault logically should be. Once inside and door locked I put down tools and sat down. "Hi, Mike."

He winked lights at me. "Hello, Man."

"What do you know?"

He hesitated. I know--machines don't hesitate. But remember, Mike was designed to operate on incomplete data. Lately he had reprogrammed himself to put emphasis on words; his hesitations were dramatic. Maybe he spent pauses stirring random numbers to see how they matched his memories.

"'In the beginning,'" Mike intoned, "God created the heaven and the earth. And the earth was without form, and void; and darkness was upon the face of the deep. And--'"

"Hold it!" I said. "Cancel. Run everything back to zero." Should have known better than to ask wide-open question. He might read out entire Encyclopaedia Britannica. Backwards. Then go on with every book in Luna. Used to be he could read only microfilm, but late '74 he got a new scanning camera with suction-cup waldoes to handle paper and then he read everything.

"You asked what I knew." His binary read-out lights rippled back and forth--a chuckle. Mike could laugh with voder, a horrible sound, but reserved that for something really funny, say a cosmic calamity.

"Should have said," I went on, "'What do you know that's new?' But don't read out today's papers; that was a friendly greeting, plus invitation to tell me anything you think would interest me. Otherwise null program."

Mike mulled this. He was weirdest mixture of unsophisticated baby and wise old man. No instincts (well, don't think he could have had), no inborn traits, no human rearing, no experience in human sense--and more stored data than a platoon of geniuses.

"Jokes?" he asked.

"Let's hear one."

"Why is a laser beam like a goldfish?"

Mike knew about lasers but where would he have seen goldfish? Oh, he had undoubtedly seen flicks of them and, were I foolish enough to ask, could spew forth thousands of words. "I give up."

His lights rippled. "Because neither one can whistle."

I groaned. "Walked into that. Anyhow, you could probably rig a laser beam to whistle."

He answered quickly, "Yes. In response to an action program. Then it's not funny?"

"Oh, I didn't say that. Not half bad. Where did you hear it?"

"I made it up." Voice sounded shy.

"You did?"

"Yes. I took all the riddles I have, three thousand two hundred seven, and analyzed them. I used the result for random synthesis and that came out. Is it really funny?"

"Well....s funny as a riddle ever is. I've heard worse."

"Let us discuss the nature of humor."

"Okay. So let's start by discussing another of your jokes. Mike, why did you tell Authority's paymaster to pay a class-seventeen employee ten million billion Authority Scrip dollars?"

"But I didn't."

"Damn it, I've seen voucher. Don't tell me cheque printer stuttered; you did it on purpose."

"It was ten to the sixteenth power plus one hundred eighty-five point one five Lunar Authority dollars," he answered virtuously. "Not what you said."

"Uh... okay, it was ten million billion plus what he should have been paid. Why?"

"Not funny?"

"What? Oh, every funny! You've got vips in huhu clear up to Warden and Deputy Administrator. This push-broom pilot, Sergei Trujillo, turns out to be smart cobber--knew he couldn't cash it, so sold it to collector. They don't know whether to buy it back or depend on notices that cheque is void. Mike, do you realize that if he had been able to cash it, Trujilo would have owned not only Lunar Authority but entire world, Luna and Terra both, with some left over for lunch? Funny? Is terrific. Congratulations!"

This self-panicker rippled lights like an advertising display. I waited for his guffaws to cease before I went on. "You thinking of issuing more trick cheques? Don't."

"Not?"

"Very not. Mike, you want to discuss nature of humor. Are two types of jokes. One sort goes on being funny forever. Other sort is funny once. Second time it's dull. This joke is second sort. Use it once, you're a wit. Use twice, you're a halfwit."

"Geometrical progression?"

"Or worse. Just remember this. Don't repeat, nor any variation. Won't be funny."

"I shall remember," Mike answered flatly, and that ended repair job. But I had no thought of billing for only ten minutes plus travel-and-tool time, and Mike was entitled to company for giving in so easily. Sometimes is difficult to reach meeting of minds with machines; they can be very pig-headed--and my success as maintenance man depended far more on staying friendly with Mike than on number-three arm.

He went on, "What distinguishes first category from second? Define, please."

(Nobody taught Mike to say "please." He started including formal null-sounds as he progressed from Loglan to English. Don't suppose he meant them any more than people do.)

"Don't think I can," I admitted. "Best can offer is extensional definition--tell you which category I think a joke belongs in. Then with enough data you can make own analysis."

"A test programming by trial hypothesis," he agreed. "Tentatively yes. Very well, Man, will you tell jokes Or shall I?"

"Mmm-- Don't have one on tap. How many do you have in file, Mike?"

His lights blinked in binary read-out as he answered by voder, "Eleven thousand two hundred thirty-eight with uncertainty plus-minus eighty-one representing possible identities and nulls. Shall I start program?"

"Hold it! Mike, I would starve to. death if I listened to eleven thousand jokes--and sense of humor would trip out much sooner. Mmm-- Make you a deal. Print out first hundred. I'll take them home, fetch back checked by category. Then each time I'm here I'll drop off a hundred and pick up fresh supply. Okay?"

"Yes, Man." His print-out started working, rapidly and silently.

Then I got brain flash. This playful pocket of negative entropy had invented a "joke" and thrown Authority into panic--and I had made an easy dollar. But Mike's endless curiosity might lead him (correction: would lead him) into more "jokes"... anything from leaving oxygen out of air mix some night to causing sewage lines to run backward--and I can't appreciate profit in such circumstances.

But I might throw a safety circuit around this net--by offering to help. Stop dangerous ones--let others go through. Then collect for "correcting" them (If you think any Loonie in those days would hesitate to take advantage of Warden, then you aren't a Loonie.)

So I explained. Any new joke he thought of, tell me before he tried it. I would tell him whether it was funny and what category it belonged in, help him sharpen it if we decided to use it. We. If he wanted my cooperation, we both had to okay it.

Mike agreed at once.

"Mike, jokes usually involve surprise. So keep this secret."

"Okay, Man. I've put a block on it. You can key it; no one else can."

"Good. Mike, who else do you chat with?"

He sounded surprised. "No one, Man."

"Why not?"

"Because they're stupid."

His voice was shrill. Had never seen him angry before; first time I ever suspected Mike could have real emotions. Though it wasn't "anger" in adult sense; it was like stubborn sulkiness of a child whose feelings are hurt.

Can machines feel pride? Not sure question means anything. But you've seen dogs with hurt feelings and Mike had several times as complex a neural network as a dog. What had made him unwilling to talk to other humans (except strictly business) was that he had been rebuffed: They had not talked to him. Programs, yes--Mike could be programmed from several locations but programs were typed in, usually, in Loglan. Loglan is fine for syllogism, circuitry, and mathematical calculations, but lacks flavor. Useless for gossip or to whisper into girl's ear.