Hand 1: No idea. I can kind of understand calling, but it's very tough to figure out where you stand, especially on an escallating pot. Villian's bet on flop signifies that his stack is going in one way or another. Do you want to risk 50bb on TPGK? (Against some maniac players, it could be fine). It's either a KK he can't lay down, or he has you smoked. I'm not a gambler (without great reads), so I'd fold the flop. A reraise is about the same as a push.

Hand 2: Turn call is really bad. I can understand if it were a 9/T/J, but the 4 fills some OESD (6/8 for instance) and a 45 FH. If you were to reraise to $4, would you fold to a push from bigmoney? I wouldn't worry about buhdda, he only has $1.10 left and was pushing regardless of your bet.

Both hands are tough because the pot got big so quick that you were basically obligated to call any raises. (In both cases with good,but not great hands).