Trombone player with camera mounted on his slider

It turns out that if you put a GoPro camera on the slider of a trombone, facing you, and then play a number, you get a perfectly synched, awesomely comical, mesmerizing video. Proof courtesy of youtuber CDMVette and his "Trombone Silliness."

Trombone Silliness (via Kottke)