Stu driving hc that I thought of after imagining them in the fast & furious AU, since Stu is obviously not allowed behind the wheel already, he takes over the aux. He turns the volume up so loud that the entire car thumps & vibrates from the bass, & sings his heart out until it annoys Billy. But Billy can't tell him to shut up or turn the music down bcs Stu would retaliate by asking Billy to let him drive, which Billy doesn't want happening cause Stu is a public threat when he's behind the wheel. So billy had to just sit through stu's loud music & singing but it's fine cause he's having fun & not pestering Billy It'd be also funny to think that while in the process of getting his driver's license, he leaves a trail of destruction behind him anywhere he drives. But somehow he got his license, so i guess there's that. Still doesn't change the fact that he's a danger to the public tho