Batty.
One morning a vampire bat flies back into the cave still drooling in blood around his face from his nightly excursion. When the other bats see this they demand he show them were he came upon this bloodfest but he tells them no and says he needs to just hang up and wear it off. However, the other bats won't let it rest until eventually he agrees to take them to the spot. The next evening they all gather together in anticipation. Out they fly in through valleys and over mountains until they eventually come to a clearing with a single tree in the middle of it. Right says the lead bat, do you see that tree down there sitting on its own. "YES", they all reply, excitedly. "Well" he says, "I didn't".