She aimed the gun at Sarah and pulled the trigger. There was a flash of light, that only Jon and Karyn seemed to notice. Sarah kept walking, there wasn't any big change in her appearance, she still wore her cheerleading outfit, still had silky blonde hair and makeup. Jon and Karyn thought she was walking a little different though, less feminine, she was walking more like a typical guy.
Jon held the rock, "I wish we knew what exactly changed in Sarah." Suddenly the answers flowed to them.
Sarah now had the brain of a typical guy. When she was a little kid, she used to play football with the neighbourhood boys, but her mother, who was a former beauty queen, forced her to stop and made her start doing beauty pageants and modeling, and when she got to high school, made her try out for cheerleading. Sarah hated everything about it, she wished she could be out on the football field with her old buddies. She was still dating Biff, but only because it was the "thing to do", there was a constant battle between them because both of them wanted to be "the man" in the relationship. She'd much rather be dating a hot cheerleader. She didn't consider herself a lesbian, just a boy trapped in a girl's body.
"Wow, that's interesting." said Jon.
"Hey, let's try the gun on Biff and observe how their relationship changes!" suggest Karyn.
"Good idea, let's go find him." said Jon. "He's probably in the weight room right now..."
