So here's what ya do next time. Make sure they have a lot of bills on them because the bars work with bills better than plastic.
When he's bent over pukin' his insides out, grab his wallet and pull most of them out. It ain't like he's gonna miss the money, he promised he'd buy right?
Then buy him a taxi with the money and take the rest for yourself. To go drinkin without his sorry ass.
I'm assuming this was a he by the way but it works just as well with a chick.