Want to see Keegan Michael-Key beat the crap out of a Muppet? 'SNL' got you.

A quick primer on The Muppet Show for anyone who's not familiar: In the original primetime series from the '80s, the characters Statler and Waldorf existed for the sole purpose of heckling Kermit and his friends. Perched in the theater's balcony, the show would break things up between sketches by cutting occasionally to the two...