When Ista was just a wee baby pup, she hit one of the drainpipes with her paw, and a gopher went shooting out. For a month after that, she was convinced that if you hit them right, the drainpipes emitted gophers. She would go around them changing angle of attack and how hard she was smacking the drainpipes. But alas for the puppy, mostly they are not gopher-shooting pipes.
This morning, she showed that she is now convinced that if you just scratch the vent correctly, it emits porn.
(timprov says, "She learned this trick from Lily." Non-VM fans: go about your business.)