Ok, so you guys probably can't read this, so I'll type it out for you since I am a nice person. :)

10) When you hear a whistle you snap to attention.
9) The band room is you locker
(I have crammed my coat in my instrument locker before)
8) Your band directors kids know you by name
  (Or we are the band directors kids, metaphorically)
7) You have a collection of Marching Band MP3s (FluffehDaCat )
6) You've used cork grade as lip balm
(Spunkyhorse14 )
5) your internet screen name is band related.
(Click on my profile. It's Swedish. Spunkys is Greek and FLUFFEHs is...Arabic?)
4) you have at least ten self-photos in uniform.
(Or you replaced your spring pictures with band pictures)
3) you've given your instrument a nickname.
(JOHN!!!!! JAYSON!!!! SQUID!!!)
2) you leave football games after halftime.
(Or basketball...)
1) bus fumes bring fond memories of band trips