The all in reraise preflop bluff.
It seems like a lot of players make this play especially in the end of a tournament. And it seems like a good move since the player will win the small blind and big blind and maybe 3 or 4 more big blinds. I don't make this play very often, probably the only time I'll do it is on the bubble of a SNG when I'm the big stack, they will fold almost every time rather than calling and risk going out in 4th place. But say it's late in a MTT, what kind of things should I look for before I make this play? For example, what should my M be if I were to make this move? I see many players making a huge blunder of making this move when their M is below 5, even if the original raiser only raised 2x BB, they have to call with any two cards because of the pot odds