Occasionally students will pull out a camera that mounts on their head. I don't allow that since it could break a canopy (and maybe the student's head) in turbulence.

I wouldn't want someone putting a selfie-stick out the small window of one of our club ships because of the potential for cracking a canopy. We just replaced the rear canopy on one of our G-103s; cost $7 by the time it was all done. Insurance picked most of it up, which means we all pay for it.

Larry