One of them was after prom with some friends, but we didn't really do anything. The reason I say this is that I've been to a few casinos in my life, very few, like less than ten times. I don't think I'd do sports gambling or anything of the sort.
Having said all of that, if I'm being completely honest, I do think that if I had enough money to waste and I was more outgoing, I think that the one vice I might consider indulging in would be gambling. Maybe online pornography, but let's not pretend that that's a thing in my life.