Prettt much all from my M&M campaign:

Had a badass biker with a deadly voice kick the party's ass in the opening round of their first encounter. In the second the hydromancer filled his lungs full of water so he couldn't shout and just beat him to death with a 2x4 he found in the trash while the other players watched in awe.

Had a super speedster that the resident telekinetic finally managed to catch. Proceeded to break both of his legs until they stopped working.

And of course the fearsome crime boss who they beat the crap out of, stripped him naked and treated as a pet while storing him in a dark shipping container beneath their oceanside hideout. They eventually made him their accountant as I recall...