My favorite has always been the hammer orchid. It has a piece that looks and smells like a female wasp, which is attached to a hinge. When a male wasp lands on it and tries to get it on, the hinge forces the wasp to slam back and forth into a pouch of pollen. After enough head banging and thrashing, the wasp finally gives up and distributes the pollen stuck to its body to other flowers. I always love imagining what's going on in the head of the male wasp as it plans to get down for a little somethn' somethin' with a little lady only to get thrashed back and forth. "WTF!"