When the first time you see this:

you can't help but crack up
When people start calling you trombone jesus
When the words "trombone" and "jesus" are mentioned in the same sentance people not only in band, but anyone else who knows you goes "what about gary?"
When you've used the line Trombonists do it in 7 positions too many times to count
when you've threatened to shove your slide so far up someones a** it knocks out their teeth more than you can count
And when you do the can-can to one of the drum cadences