A vampire bat comes flapping into his cave one night covered in fresh blood and parks himself up on the roof of the cave to get some sleep.
After a few minutes all the other bats smell the blood and start to hassle him about where he got it. He tells them to go away and let him sleep but the bats continue their pestering until he finally gives in.
"OK, follow me," he says and flies out of the cave with hundreds of bats behind him. They go down through a valley, across a river and into a forest full of trees. Finally he slows down and all the other bats excitedly mill around him.
"Now, do you see that tree over there?" he asks.
"Yes, yes, yes!" the bats all scream in a hungry frenzy.
"Good," says the first bat, wearily. "Cos I didn't"
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