used a vending machine a few weeks ago. tried to get salt & vinegar chips ($1.50), second row from the top. they got stuck. instead of getting a second bag, i decided to get the famous amos cookies ($2) just above them, hoping that the bag of cookies (presumably heavier), would brush the chips, dropping both to the bottom. instead, the famous amos cookies fell, but not the salt & vinegar chips.
i then deposited another $1.50 into the vending machine and got the salt & vinegar chips - and both bags fell to the bottom.
so, instead of spending $1.50, I spent $5.