Robert Downey Jr. and Jimmy Fallon share glimpses of their failed 'SNL' sketches

Robert Downey Jr. and Jimmy Fallon may be two of the most all-time successful Saturday Night Live alumni, but that doesn't mean everything they did was a hit.

In fact both of them, it turns out, have a few failed SNL sketches under their belts. 

In the video above from The Tonight Show, they share glimpses of them. Downey...