Someone posted a clip with Foster the People (few days ago) and claimed it was the best live performance ever.

Well, it was a great performance indeed, but there is something better. An extended version of "Dead Disco" by Metric (live in Montreal 2006), for example. You can find it on the official DVD, Live at Metropolis.

This is absolutely mindblowing. MINDBLOWING. And a bit insane.
Part 1: http://www.youtube.com/watch?v=B_4FZN4mGI8
Part 2: http://www.youtube.com/watch?v=W0JyGmc9pPI
(the uploader split it in two parts)

If you watch it, please watch the whole thing (around 15 minutes total). Also I recommend you to use the headphones (you'll understand why ;)). This is definitely one of the most intense live performance I've ever seen.

Now, your turn.