I thought it was a good joke, even though I didn't understand it fully. like the part about it not even being certain that there is a solution.
Here is a Vermont joke, which involves hammers. (There is even a bit of very, very simple math, so I guess it kinda, sorta qualifies for this site.)
This farmer walks into a hardware store, and buys a hammer for $10. Twenty minutes later, he is back, and he buys another hammer. All day, the farmer keeps coming back to buy hammers. Finally the hardware store owner asks him what he is doing with all the hammer.
"Selling them," replies the farmer.
"Yes, I buy the hammer for $10, and then I go out on the street and sell it for $5."
"But you are losing money each time," says the store owner, puzzled.
"Yeah, I know," replies the farmer, "but it sure beats the hell out of farming!"