Beavis & Butthead sketch...
One of the best SNL skits ever:
https://www.youtube.com/watch?v=86qKgK0asGo&t=235s
This is what's so great about live sketch comedy...and why SNL can sometimes create something pretty great out of everything coming apart. Heidi clearly had not seen those guys in full make-up prior to the live show. Her response is priceless.