Two bats are hanging upside down from a tree branch, smoking their pipes but awfully hungry. They haven't had anything to eat for hours, maybe even days and they desperately want blood. So, one of them puts his pipe away and flies off in search of nourishment.
A few moments later he comes back, completely soaked in blood.
"Whoa!" says the other, "where did you find so much blood??"
"Do you see that big building looming in that direction?" says the bloody one.
"Yeah."
"Well, I didn't."
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Guess he had small ears.