Biff was getting changed into his gym clothes when it started. He was standing in front of his locker, had just taken his shirt off and was pulling down his pants when, from behind him, he heard the voice of his buddy Steve.
"What the fuck?!"
Biff whipped his head around and looked to see what his friend was looking at. It wasn't, as Biff expected, one of the dorky kids in the class who Biff and Steve often pick on. Instead Steve was staring at Biff. More precisely at Biff's underwear.
Biff, captain of the football team, tough guy, all-around-super-stud, looked down in horror at the panties he was wearing.
Quickly he finished taking off his pants and grabbed his shorts, throwing them on before anyone else could see. Too late, though, as Steve, Moose, and pretty much everyone in the locker room was laughing at him. Even that dorky kid Jon was laughing outright. It never occurred to Biff to take off the panties, nor did it occur to him to come up with some sexual conquest story to cover up. All he could do was walk out to the gym, blushing bright red, with the feel of the g-string pulling up his ass crack.