When I was in high school, the soda machine had a slightly sticky bottom door. So Soda would drop, hit the door at the bottom and not quite come out. All you had to do was flip the door with your finger and it came out. No one of course realized this. Many many a day I would get 3-5 soda's when I bought one. Then I just stopped buying soda and a few times a day walked by a flipped the door, and out came the already bought soda that was abandoned by dummies.

Thanks for my raging soda addiction magical soda machine :P