Never had a table flip in Diplomacy. Guess my lot was too passive-aggressive. Mostly if someone got butt-hurt, they'd either go nuclear and make whatever lopsided deal they could to hand the game to anyone except whoever it was who back-stabbed them or they'd just go entirely limp and plan nothing for their moves.
(I confess that I once flipped the A&A board while in high school. I attacked a convoy of 3 transports with 6 fighters and lost all six planes. I think I sunk one ship....maybe...)