Not long ago, Joseph Gordon Levitt on Saturday Night Live did an admirable homage to the great dancer / performer Donald O'Conner. Of course O'Conner's "Make em Laugh!" is revered as one of the finest comic dance performances ever captured on film. I really liked the JGL version though, particularly the awesome stunt at the end.
Then watch the original routine again (and again and again…) You're welcome.
(Hattip, Miss Jeskat.)