"Still Alive" Singalong with GLaDOS at GaymerX, with a BIG surprise

During the Voice Over panel at GaymerX in San Francisco, Ellen McLain (voice of GLaDOS from Portal) and her husband John Patrick Lowry (Sniper from Team Fortress) surprised everyone with a singalong of 'Still Alive' from Portal. But that wasn't all: there was a BIG surprise for one audience member in particular. Jump to the 5:00 mark for the big surprise.