trombone suicides

A kick-ass trombone routine often done in front of large audiences
A line of trombone players stand with their feet shoulder-width apart
In the line, every other trombone player either moves their trombone up and to the left, or straight down.
The trombone player going to the left moves their trombone above the person's head, then they go back to the middle and the other trombones do the same thing

The trombone suicides were so awesome, one them almost got a concussion