It actually happens quite often. You're hungry and there's the company vending machine enticing you to buy some junk food. You plop in your money, press a few buttons for your selection, the rollers move...

You eagerly anticipate your food to drop into the exit chute...

... and it gets stuck.

November 4, 2011 - I usually don't really care too much when I see vending machines get stuck but it was curious when there were TWO items stuck on this spiral machine. I forgot when I saw when someone wanted to get popcorn but this second person must have come up and thought "Jackpot! 2 for the price of 1!"... and to their dismay the machine decided to eat the money instead.
Vending machine: 2, hungry persons: 0

November 10, 2011 - I came back to take a look... Apparently someone tried to take their chances and get a three-for-one. Who could resist? THREE bags of popcorn for the insane price of $1!
However the machine had other plans. Sorry, the spiral pusher did push the two previously purchased and stuck bags of popcorn out of the mechanism, but their escape was short lived - they got jammed on the exit chute. To make matters worse, the newly purchased popcorn got stuck too.
Vending machine: 3, hungry persons: 0

November 10, 2011 take 2 - I came back to the vending machine again and noticed someone buying Cheetos on top of the two jammed bags of popcorn. And it got stuck too. Why buy that bag of Cheetos, they should have bought the one at the top and hope the additional momentum of the higher, falling bag would knock the popcorn out, at least bounce the Cheetos out too instead of getting it stuck too. Even better, buying the more dense, aerodynamic Twizzlers that would fly downwards without hitting terminal velocity would increase the chances of getting something.
Vending machine: 4, hungry persons: 0

November 11, 2011 - Looks like someone was hungry for popcorn again and the vending machine says... "DENIED!" Why not just get the unencumbered bag of Doritos? Or at least choose something that's not on top of the now blocked exit chute?
Vending machine: 5, hungry persons: 0

November 14, 2011 - Weekend passed. Looks like vending machine refills don't occur over the weekend.

But it looks like someone fished out two free bags of food! Can't seem to discern any purchases...
Vending machine: 5, hungry persons: 2

November 15, 2011 - Ahh... not sure what happened here. There are hints that the machine was refilled as I thought on Monday there was only one bag of Doritos left but now there seems to be more than one... However the creases on the bag looks like it has not been touched. The popcorn still still hanging there, though at a different angle... Not sure where to award points to, if the vending machine refill guy gets the popcorn, the vending machine should be awarded points as he's working for the vending machine. But perhaps someone got the stuck bag of popcorn... For now I'll give hungry people a point for grabbing the bag of popcorn stuck at the bottom, but really not sure without watching the replay...
Vending machine: 5, hungry persons: 3