Anyone every notice that when you are losing you can't wait to play again and when you are winning you are just looking for a polite way to hit the door and bank those winnings. That is common to all investment that involves risk and uncertainty. There are hundreds of book written about this same phenomenon in the stock and commodity markets (and I have read a lot of them.) We all want to feel good and winners feel good, losers feel bad.
This scenario plays out in miniature through out a MTT. For example, blinds are 100/200 and one of the players gets his stack wacked on a vicious bad beat say aces beaten by tens. He was the table leader at 7000 chips and now has 4000. No matter he is still in fine position chip wise, he's wounded and wants those chips back now, right now. Do not steal from this man for several hands, especially the very next hand in the game. He is far more likely to call and raise. Be however more willingly to play strong hands for more chips. I think ripptyde would agree this is not the time for your standard 3x the BB raise with 7-4 off into this man's blind.
The converse is also true to an extend with many players. I however feel slightly less confident about this point as it is dead wrong for a few players. If someone is recently won a big hand or two, they usually are a little easier to steal from. It is a emotional high to win a couple big hands and many people will not want to risk their chip position immediately without strong hands. However, a caveat, a few players immediately start playing like King Kong with a big stack calling everything in site, so you have to exercise caution as always.