A man walks into a bar

He orders whiskey with no ice. He drinks it straight, in one shot. Then he asks the bartender "Excuse me, do you know how tall penguins are?"

The bartender, confused, says "I don't know, maybe half a meter?" Then, the man orders another shot, drinks it straight. He asks again "And what would be the tallest a penguin can be?"

The bartender, even more confused, answers "Probably a meter" The man orders yet another shot, no ice, and drinks it.

"Then I think I ran over a nun"