Why was 5 afraid of 7? Because 7 8 9.

What are the 10 kinds of people in the world? Those who understand binary and those who do not.

What is hard and yellow and equivalent to the axiom of choice? Zorn's Lemmon.

What did 0 say to 8? Nice belt.

What are the 10 kinds of people in the world? Those who know ternary, those who do not know ternary, and those who confuse ternary with binary.

When Noah got off the ark, he told all of the animals to go forth and multiply. A month later, all of the animals had multiplied except for two snakes. Noah asked the snakes why they had not multiplied, and the snakes said that they needed Noah to cut down the tree next to them. Noah obliged and when he returned a month later he was glad to see that the snakes had in fact multiplied. But Noah was confused and asked the snakes,"Why did you need that tree to multiply?" And the snakes replied, "We're adders, we need logs to multiply"