im not saying they're the best in history because i am by no means a movie expert but a few that i thought were pretty cool:

The steven segal slow motion mow down of a bunch of guys in a train yard.

Rocky 4 when rocky beats drago across the ring during their fight.

Rocky 1 when he gets up in round 14 and waves his arms in a "bring it on" kinda motion.

Cinderella man when he gets hit with a heavy punch and his mouth piece flies out and all he thinks about is the empty beds where his kids used to sleep and they aren't with him anymore because he doesn't have the money to pay for the heating bills. He just looks, smiles, and puts his mouth piece back in.