Sting back in 1991 played Billy Idol in the famous Sinatra Group sketch. 

Katy Perry was also the musical guest on May 20, 2017 with host Dwayne Johnson.

Alexis breaking the bathroom sink in Rose Apothecary having sex with Ted while she was supposed to be watching the store, and then trying to cover it up.

Prince, in his final (little did we know at the time), incredible, 8-minute-long performance on Saturday Night Live on November 1, 2014. Just ridiculous and amazing.