Not The BandYou will need: One or more players; little regard for yourself or others.
Rules: Whenever you use the phrase "you too" or "you two", immediately disambiguate your usage by appending "(Not the band)", as if you spend so much time talking about U2 that it's a source of constant confusion. That's all. It's a sort of combination of weak joke and nervous tic, and becomes second nature surprisingly quickly.
Advanced game: Once you've established your habit of painstaking disambiguation, you can start looking confused when anyone else uses the phrase and doesn't clarify their meaning. Interrupt them, just to check that you've got things straight. They'll be puzzled at first, then annoyed (and, be warned, that is where they will remain). However, you can stop after the first few times and they'll still know that you're thinking it, at which point they're playing too, like it or not (not, obviously).
Scoring: As with all our games, it's played for its own sake. The idea is for this to become a life-ruining habit like The Game (which I just lost) rather than something you play for points. Still, I'll include some arbitrary scoring rules to give you an idea of how it's supposed to work.
- Lose a point every time you say "you too" without clarifying.
- Gain a point each time someone else makes this clarification to you.
- Gain an extra point if they do so unprompted.
- Gain 10 points if someone else starts playing, whether deliberately or out of habit.
Winning: No-one wins.