Working with a second-year player on the high register, I was refreshing him on the fingering for high F...
ME (demonstrates fingering): So remember, it's these three on the left side, and this one on the right.
KID: And the octave key?
ME: Oh yeah--you always use the octave key for notes this high, or you'll end up making a seal sound.
KID (ponders that for a moment): But *can* I make a seal sound?
ME (ponders as well): Sure man, knock yourself out.