For most of us, the worst thing we ever did in high school was skip class or stay out too late on the weekends. For this guy, who shared this years-old secret on the r/Confession page, he did something apparently much worse, according to some commenters: he swindled thousands of people out of their pocket change as they bought snacks! The story goes that this dude was in charge of a snack table at his high school's sports games. But without any type of menu dictating prices of snacks , he took…