What's the most embarrassing moment you've ever had on stage?

The back of my pants ripping out. It was the last song of the set and I was high-fiving and knuckle-bumping and all that stuff and I felt my pants rip. It wasn't a huge rip, but I knew it happened. So I stood up and waved and walked backwards off the stage, and I was all the way out at the end of a runway!