This video because I am a huge nerd. Also this video (NSFW!) because it is the funniest thing in the whole world. Kanye’s song Power. Albums and songs by Monty Python, MC Frontalot (quite a lot of songs), U2, the Toronto Mendelssohn Choir (singing Handel), Kathleen Battle, Michelle Branch, OAR, old Madonna, TMBG, Jessie J, Jonathan Coulton, the Muppets, P!nk, the Police, the Lion King, and the complete soundtrack of Labyrinth.
What about you?