http://www.devilducky.com/media/58492/

This would take some very patient friends.

hmm this one is not as good as the space invaders one that is posted a few posts down. I really think they could of done a better job on the sound :( .. but yea alot of time and work went into it

I turned the sound off...

More than anything, I'm impressed with the length. That's a lot of time involved with, "Okay everyone, move down one chair. Okay, stand up, repeat. Repeat. Repeat. No you can't go potty or have lunch, stand up!"

I bet a lot of it is digital and didn't take very long. Once you had a photograph of a given "pixel" in a given chair, you wouldn't have to re-take that pixel again if you didn't want to.