Hahaha. Guitar Hero II is HARD when you're drunk. Awhile I was at a buddies and their were about 10 of us there, it was about 4am and we were all pretty drunk and tired. Playing Guitar Hero is next to impossible, but fun at the same time.
CS:Source is fun when youre drunk by yourself. But not playing an actualy match, because that makes it incredible hard not to die. It's better to play gun game or better yet, zombie mod 2.0.