The longer I stay at a cold table, the more inclined I am to remain there. Remember the first rule of poker probabilities...over a long enough period of time, everyone catches the same number of good cards. I'm always reluctant to change tables following an extended cold streak because I know that a rush could be right around the corner. If I change tables, I may change right into another cold streak and extend the drought even further.
Ignorant players blindly bouncing chips off the walls will make me leave a table a lot more quickly than cold cards.