I always teabagged on Rainbow Six 3:Raven Shield on PC. just really satisfying because of the death cam and lack of respawn until the round ends.
Wouldn't make sense in CoD with the respawning, but I think I've done it once or twice anyway.
EDIT: more fun in CoD to stand behind them if they are camping for a few seconds so they'll see you standing there for quite some time before you execute them.







