I have been to a number of house parties where people take a bottle of wine, or a couple of cans of cheap beer, but then dont drink it and drink the expensive wine or beer or spirits that the host has provided.
Then at the end of the night, they take their wine/beer back home because it hasnt been drunk.
I think this is so rude. If you are taking drinks to a party surely you should be drinking that. It just amazes me how many people seem to do this. They might turn up with two cans/bottles of beer, but drink six or eight because someone else is paying for it
AIBU