I used to work at a vitamin store and there was one cat in the neighborhood that would come flying into the place whenever the door opened, shoot across the floor, leap six feet onto the top shelf and start ripping into the bags of valerian root. He/she loved that shit -- apparently valerian root is a cat thing, just like catnip. We had a sign up on the front door with a picture of the cat and the caption "DO NOT LET THIS CAT IN", which sort of worked but not always.