Another one for Nick in "Nick's Return": Having been in a coma for 2 episodes, he forces himself awake after hearing on TV that the producer's jerk of a son will replace him if did a good enough job subbing for him that night.
It get's better! Once he's awake, Nick broke said TV (probabily in anger), stole an ambulance, drove back to the stadium, KO'ed said son via headbutt, and went back to work in time for the episode's main event, "Marilyn Manson vs. Garth Brooks".
Nick and Johnny fighting Sam Donaldson (because he tried to take over their show by claiming they were dead) in "A Celebrity Deathmatch Special Report."
The next episode, with blink-182 and 98 Degrees, is one big CMOA, mainly because it has the two bands fighting in huge ass Gundam-esquerobots for most of the episode.
Jason Alexander, Julia Louis-Dreyfus, Michael Richards breaking up Jerry Seinfeld's fight with Tim Allen... to kick the crap out of Jerry for endingtheir show.
Bonus points for Richards' speech.
Pamela Anderson was getting beaten easily, then her opponent, RuPaul, decides to flirt with Pam's husband at the time, Tommy Lee. Pam doesn't take this well, and she starts beating up RuPaul like she was born to do it!
From the revived episodes: Pamela Anderson kicking Tommy Lee's ass because he gave her hepatitis
Madonna kicks Michael Jackson into a pit of hydrochloric acid. Not only does Michael survive, but is also completely unharmed aside from having his plastic surgery removed.
David Spade coming back from being curb stomped by Steven Seagal to actually win the match by slingshotting Scottie Pippen's championship ring through Segal's head.