Hahaha, I think that happened to me once, but I was at school scratching my thigh (cause it was teh itchzors). It happened like this:
I was just sitting in class during fourth period which is my mathematics course; when all of a sudden my thigh starts to itch, so I try to ignore it. After a while the itch turned into more of a stinging sensation, so I just had to scratch...I put my hand down the side of my pants and started to scratch my leg. What I didn't mention is that the person who sits in front of me is a dude, and the sound of the scratching caught his attention; which then caught my attention so we glanced at each other for about a second and when he saw my hand in my pants; he assumed that I was beating off to him and proceded to say "ewhhhh". This then made the class look at him; which then made them look at me, including the teacher, and everyone LOL'd as I was sent out of the room and to the office with a referal. I explained to the dean what had happened and he decided to send me home with a one day Out-of-school suspension. The day I went back people thought I was teh gheys, so I had to explain what really happened that day...no one believed me and it stayed with me until 8th grade (the event happened near the end of sixth grade), which was when I moved to a new location.
It didn't bother me that much near the middle of seventh grade and I just told people to "believe what they want to believe" and this made people scared of me. Like, I used to walk up to people before and they would be like "sup?", but after that incident I would walk up to someone and they would run, yelling "rape, rape!" and I never understood why. Teachers were always talking to me about it and they even considered me for counseling...so I guess I got owned IRL or something...it's another reason I don't wear sweatpants anymore.