Say hello to my little friend: Crash mode in Burnout 3! Take turns trying to cause the biggest pile-up or simultaneously cause pure havoc! It only supports 2 players at once (8 players switch-off) for that, but really, there is nothing more fun to watch than insane crashes full of twisting metal and explosions.
We also have tons of fun with the Road Rage racing mode, where the objective isn't to come in first, it's a race to see who can take out 10 opponents first. Always a good time when you're bumping your friends into walls!
I'll second that one. My brother and his wife came over on Monday, and we spent close to 5 hours playing Burnout 3. Road Rage is so fun and easy to pick up that even Mrs. Gratch & my sis-in-law (who detests video games of any sort) were having a great time with it.