Yea, I remember back in the 7th or 8th grade there was this super hot blonde in my class. All I had to do was give her a quick look and bam, there it was! One time I got called on to go up to the blackboard and I was definitely "at attention", so I told the teacher I'd rather not. She said this as part of my grade and I still told her, sorry but I don't think I'm up for it today (actually I was too up for it!). It usually happened around the same time each day, the blonde notwithstanding. I think it was around 10-11:00am. Must have been my body's rhythm. And it doesn't help that we're usually super self-conscious at that age.