Saturday Night Live opened its 40th Anniversary special in the best way possible: Jimmy Fallon and Justin "This Generation's Steve Martin" Timberlake doing a medley mash-up of SNL's greatest moments in its 40 year history. Yep, everything from "Jane, you ignorant slut" to cowbell to Debbie Downer and more.

These two should do stuff together more often, don't you think?