You're a theater kid. You had been chosen to play Veronica Sawyer from Heathers. You had a lot of lines as a protagonist, and you needed to practice with someone.

You went to the sewers to see who could help you. Unfortunately, Leo was occupied with training, Mikey went out for a while, and Donnie was working on his lab. The usual thing, y'know.

That leaves us with Raph as your only option, so you walked up to him with your script in hands with puppy dog eyes. He immediately knew you were gonna ask him for something.

He looked at your script and read the name 'Heathers' on the front. He knew what you wanted immediately. "Nope," he said as he started to walk away. He thought that play was cheesy and embarrassing, so there was no way he was gonna do something related.