Sometimes, during high school orchestra class, a student just goes through the motions. (S)he'll play the music without regard for dynamics, rhythm, or intonation.
I once saw a more overt display of this. During a break in class, a student counted out a piece's rhythm by announcing, "One, two, three, (effing) four! One, two, three, (effing) four!"
"Sounds like someone doesn't want to be here today," I murmured after hearing his profane counting. "He sounds surprisingly calm, though."
