i went to wal mart today and i pressed the mello yello button and out came a vault, then i pressed vault and out comes a mello yello.. but then.. i press coke and out comes a coke:O
but at the gas station i usually go to. where the mello yello usually is .. theres vault and theres vault where vaults sposed to be too.. are places dumpin mello yello for vault?????????? or what

lol, you pressed coke and a coke comes out

Pibb,,,,,tread lightly, you are entering sacred ground. You are about to reveal the conspiracy by COKE to confuse their customers and maintain sales through deception and cunning.
Or, you could have had the misfortune of walking up to a machine that was loaded by a rookie or someone in a hurry who just made a mistake and put the wrong cans in the wrong slot!!!!