I did when i was 19-21 mostly would get called to fill in if other people would cancel. I enjoyed it as long as I didn't have to sit on a stool. The stools at art classes are garbage, uncomfortable and with a skinny ass It would either end up with sore back or leg would fall asleep heheh. I used to find it more interesting say if i was stoned and listening to music while they did their thing. You could just zone out and let your mind go. I did once have to do a class that were animation students, I had to run on treadmill or walk and they were supposed to try and key out points and motions. That one was neat.