During a grade 6 camping retreat, my best friend and I got in trouble for gambling, playing five card draw with evenly dealt chips and no actual money.
It was eventually officially decided that the chips were the problem. We collected rocks from the gravel road and played with those instead. Our roommates who originally complained were pissed, but five card draw with pebbles instead of chips was apparently allowed
When I was in 8th grade year, right before the end of the year in one of my classes, we ended up having a substitute teacher. For some reason, she and a few of us were talking about poker and that we, the students, didn't know how to play.
The next day, she brings in cards and chips and is trying to teach us how to play! She did say that she probably shouldn't be doing this, but continued anyway. Interestingly, this was in Utah, in a suburb of Salt Lake City, which is the capital of the Mormon church. And she herself was Mormon. I always thought it was funny that our Mormon teacher was teaching us how to gamble in school!
One of my math teachers spent an entire semester teaching us how to gamble. He used it to teach us how statistics and probability worked. Final assessment was to set up mock bookie offices for a fairly famous local horse race.