Yeah when i was at school about 3 yrs ago now. We had our usual wednesday afternoon 2.5hr sports sessions. Mountainbiking was one of the choices to choose from. We used to have a maximum group size of 15 but usuall it was around the the 10 person mark. I went to school up in the north coast near coffs so for every session, we had to vote on what route we would take, it varied from old logging/ fire trails, to private farms, to gravel rds to national parks walking tracks. It was awesome, there were the usual 4-5 serious kids that had on there pro kit and on a specced out racer trying compete with each other, then there were the lunatics on DJs a bmXers that just cruised back hitting any type of obstacle that resembled a jump or stunt move as well as fishtailing at speeds up to 60km/h, in the DJ group there would be the occasional newbie with the Kmart rig trying to impress the guys and come a buster getting speed or launching off the bank.
The teacher was a bit of a champ, he could never control everyone, the speed demons raced off, the DJ's ran a muck and the teacher would try and get everyone to stick together without success. It was a comical part of the week, and i know the teacher would have found it quite funny himself. Any way the majority of the time there was usually carnage by the end of the ride with rider and or bike suffering some damage.