I caught Chicken Pox in kindergarden, and had a really really bad case - I was out of school for a month. I had them in my mouth, my ears, and I'm sure in my privates, but honestly, I doubt I noticed. There's the standard "aww, so cute, child covered with chicken pox" picture in my mom's album - I was completely covered with calamine lotion, head to toe.
I remember actually poking the boy who had them at school in the stomach - he was showing off his pox to everyone . I think I was the only oen who caught it that badly though.