I start to hear that guys' beneath-the-belt equipment turns into a gigantic baseball bat at random moments, with no prior warning.
The process is called "getting a boner," or "popping a boner," when it happens in an embarrassing situation, like when you are visiting your grandmother or giving an oral presentation in class.
8th grade, around my 13th birthday:
I start experiencing my own baseball bats at random moments, in the locker room, in science class, at church. They are usually easy to cover up with a hymnal or a science textbook, so no one notices.
The story goes on from there. No way I could publish it on this blog. You can read it on Tales of West Hollywood.