June 23rd is the birthday of Joss Whedon. While known for dark and generally serious shows such as Buffy the Vampire Slayer, Angel, Firefly, and Dollhouse, he has been known to show a sense of humor. In additional the successful Dr. Horrible's Sing-Along Blog, he is sometimes caught on camera doing fun things. Here is Joss pretending he's someone dressed up as him.

Also, while it's not very comedic, you can check out the fanvid I made for Serenity.