The most badass thing youve seen in a fight

[Tiozzo]

Echols turns to look at the referee at 5:14, HOPKINS then goes on to land the meanest, FU straight right ever off the ropes.

yeah right, off the ropes, it was more like HOLDING THE ROPES, which is illegal

[RubenSonny]

Ali looking over his shoulder at Foreman on the canvas is my favourite image in boxing. My second favourite would be Robinson at 3:07.

[dans]

Pacquaio-Morales I:
Morales turning southpaw in round 12

Whats your pick?

I'd say that's as good a pick as any.

Other contenders:
Arturo Gatti breaking his hand in Gatti-Ward 3 and continuing to throw it
Mosley's destruction of Margarito
Sergio Martinez KO of Williams
Roy Jones behind the back trick KO
Bredeis Prescott KO of Amir Khan was just completely badass
Mayorga - enough said

and my surprise badass moment which many might not like, Winky Wright standing and taking massive bombs from Shane Mosley like they were punches from an infant