Don’t you hate it when your snacks are stuck in the vending machine? It can cause people to freak out, but there is a solution, and shaking the machine is not it.
That could cause the machine to fall on you. It is best to order something from above what you wanted, because when the item falls, it could hit your snack.
It’s also possible that if you order something from the same row, the vibrations could cause what you originally purchased to shake out and fall.