After spending the last couple months learning Mozart Sonata k330 and Haydn Sonata 54, my teacher decided it was time for something simpler to give me a rest. He assigned a Mozart violin/piano duet sonata (I have NO idea which one it is, since he photocopied it out of his book and it's not labelled), and a Schubert piece. I'm going to my lesson tonight and saying "No" to the Schubert and telling him I'm learning Transylvanian Lullaby from John Morris instead. (The theme from Young Frankenstein). I know, I'm taking "simpler" to a simpler level than what he intended, since I can pretty much sight read the whole thing.... but I'm hoping he'll figure out the violin part for it.
When I think back to when I was taking lessons as a teen, there's NO way I'd say "no" to anything my teacher asked me to play. Not sure if it's my developed self confidence, of just my extremely affable instructor, but I like the change.