Charm his hair orange
Great. Monday. Snape hated Mondays. It was on these days that he had a double lesson, first thing in the morning, with Gryffindor and Hufflepuff. In his opinion the two most idiot houses there were. Stupid idiots who throw themselves into danger and stupid idiots who… what were Hufflepuffs, anyway? But this year, his Mondays were even worse. Those two Weasley boys, Fred and George, were in his Monday double.
Snape glanced at his watch, and groaned. He was late, meaning he'd have to miss breakfast. On a Monday. With double Gryffindors. Including Fred and George. There was no way this day could get any worse.
Striding swiftly through the deserted corridors, Snape finally reached his dungeon classroom. He flung open the doors, and strode inside. The many conversations that had been going on hushed as soon as the class noticed Snape standing in the doorway. They all seemed to be staring at his head. Two hands shot into the air. The Weasleys'.
"What is it?" Snape snapped at them.
"We were just wondering, sir," they said in unison, "whether you had your hair that colour for a particular reason." Snape's hand shot to his hair. Summoning some water into his cauldron, Snape peered in. There was no mistaking the bright orange colour of his hair.
"Fred, you know how all the pureblood families are related?"
"George, I do believe you are right."
"Well, surely that means that we are related to our dear teacher, as his beautiful hair now shows us." Snape ground his teeth together in frustration. He knew they had done it. He didn't know how, but they had. And he also knew that he could never prove it.