I spotted this one at Joystiq earlier today. It’s a children’s choir singing Still Alive, the amazingly wonderful end song from Portal. I can’t say I’m entirely sure about having a choir full of little kids sing these particular lyrics and you have to wonder if most of the parents in the audience had clue one what they were hearing, but none of those questions makes this any less adorable. (Note that it's impossible to see anything in this crappy video. Just listen and enjoy.)