One time the board was an AKQJ10 with no flush possibility, a clear split. This bastard shoves his entire stack (about 10 times the pot). Basically if you called him, you might end up paying more rake than your split of the pot if you call. Maybe that was his strategy.
Good question. I rarely put anyone on the same hand as mine.
I wish more people did think about this...sometimes its painfully obvious when you and your opponent both have a king for example and it makes a gutshot. But he insists in shoving it all on the next steet...I guess some people like paying big rake in split pots.