If you are short stacked near the bubble, try to remember that you only have one move. All in.
If you are putting in standard 3x raises, and you have only 12-15 times the BB, then people suspect that by calling your small raise, you might be pot-committed, and with a favorable flop, they might win 4 to 5 times what they had to put in to see the flop. This makes almost any hand playable to a big stack.
I'm a big fan of playing aggressive late if you have some fold-equity, but if you are closer to bubbling out, you might want to tighten up and play only the very best hands for very big pots, and then get into the money before going into desperation mode.