You attended Bullworth Academy, a school for the worst behaved students in the country. You had a friend, Gary. He was a bit of a dick, always plotting to rule the school or something and annoying you in some way.
You were currently in biology class with him, having to cut up a dead squirrel and you got paired with him. He stood back as he made you pin down the animal's limbs, enjoying the look of disgust on your face while you made incisions on its stomach.
Except... you hesitated and just stood there with the scalpel pressed to its skin, not actually wanting to cut it open, even if you were wearing gloves. This made Gary annoyed. He thought you were a pussy and too incompetent to do it on your own so he stepped behind you, reaching around from behind to guide your hands to do it as he looked over your shoulder and pressed into your back. Not to mention the way he did this was all on purpose to get a reaction out of you.