The 1989 acoustic performance at the MTV Video Music Awards by Jon Bon Jovi and Richie Sambora of "Living on a Prayer" and "Wanted Dead or Alive" that inspired the Unplugged series.
Of the fifteen katas that I've learned so far in my karate training, Yansu kata is my favorite. This is a video of someone from the Kyokushin discipline performing it. (Kenshikai, the discipline I study grew out of Seido, and Seido grew out of Kyokushin.) (It should be noted that the version I do is slightly different, but only slightly...)
A truly spectacular mushing together of Super Friends and Friends. I especially like Robin being Phoebe....
In the same vein: A mushing together of a Super Friends cartoon and a Mr. T cartoon to do "Superman Retires," using the soundtrack from Rocky III.
George Lucas in Love, a short film that shows young film student George Lucas in 1967 being inspired to write Star Wars.
The Boogie Knights performing the 25th anniversary version of "Polymorph Your Mother" at Shore Leave 29 last year, complete with me fucking up my line. *sigh*
And last, but by no means least: A performance by my friend Walter Stutzman on the piano.