Robodoor
The soda machine at my office is possessed. If you push the coke button, you have probably a 2 in 3 chance of getting a cherry powerade. Mr. Pibb is slightly more reliable though the powerades do pop up from time to time. Now if you want a Sprite, you are almost assured of getting a Diet Coke. The only button on the machine that seems fool proof is, in fact, the cherry powerade button.
I'm really not fond of powerade.