The ability to pop a woodwind player in the back of the head from 4 feet away. The Trombone is the greatest of all Brasses. Trombonists don't finger, they just slide. The way all the water in the horn drains out onto you when you pressbox. The Trombone is lighter than the euphonium.
Trombones have the longest slides.
More Top 10 Reasons why you should play the trombone 10. Even MORE reasons to play trombone 10. Doubles the flow of Testosterone. Chicks dig the big cases. Works as a lightning rod.