There is one quote in Poker I really like "Hero to Zero" it often happens when a chip leader refuses to deal and then goes and lose's the lot, quite often they feel invincible and think they are going to win every pot but that is when they have to careful because the other players really don't care and will go all-in with any two cards, because they don't want to drag it out any longer.
I have been on both sides of the coin and usually will deal if the table is around even in stacks and the others agree, but if I have a huge chip advantage I will play the same way as a player who does not give a damn and call with practically any two card's, I have even in some games called without looking at my hole cards (blind) and won hands with some really dumb cards, like 7/2 and 6/2, hands I would normally fold, but to be honest any two cards can win at the showdown, that's Poker!
When the fun Stops, STOP!