Sliding a machine is an accepted move to save a ball. I am for all legal moves that saves a ball. Rage tilting, kicking, slamming lockdown bar, etc is unacceptable in my opinion. It's bad sportsmanship. I know that really none of that is hurting the game, but it's just bad sportsmanship. That and seeing a 40 year old man throw a full blown temper tantrum is stupid too. I cannot stop these things from happening, but it definitely takes some of the fun out of competitive pinball if it happens around me.