The youngest in training Shadowhunters were sitting down at the feet of the Clave, listening to them talk.
"The Clave is supreme. We are immensely powerful, and not afraid to show it. The Clave is respected by every Shadowhunter, even Downworlders." It was just the Clave's luck that Valentine came in, not giving two (or one) shits about who was in the room.
The young Shadowhunters looked appalled, and the Clave said, angrily and embarrassed, "Valentine Morgenstern, show your respect to those who are your elders!" Valentine looked over, with his blonde hair, bright blue eyes, healthy tan skin, and noticeable muscles making most of the female in training Shadowhunters fangirl, and said "You want me to show my respect?" he sighed. "Very well."
He then held up both hands to both sides of his face and put both his middle fingers up, and started sashaying out of the room saying/singing "Fuck you, Fuck you very much!" Which had everyone in the room make different expressions.
Clary looked and said, "Valentine, I swear to Raziel, go sign your death wish and plan your funeral, or so help me I will do it myself," while trying to contain her laughter, while her brother Jonathan was all, "Whoo! GO DAD! SHOW THOSE BITCHES WHO'S BOSS!" Jace looked over, then buried his head in Clary's hair so he didn't burst out laughing, while Alec held onto Magnus with tears in his eyes trying to hold back his laughter, with Magnus struggling against Alec trying to join Valentine.
The older Shadowhunters just shook their heads in exasperation while Jocelyn was outright laughing and Luke was mouthing the words Valentine was singing.