The marauders would transfigure a broom into a mini van to go on a camping trip. Sirius is driving because “please, I can handle a motorbike this will be easy”. It turns out driving a van is not the same as driving a motorbike and he’s shit. Halfway through the drive there, Mary asks Sirius how anyone gave him a pass on his driving test. Sirius of course has never done a driving test nor did he know you need to have a driving license to drive. Mary and Lily have a go at him and he ends up giving up and letting Lily drive because “James thank godric that happened I thought we were going to die” (this of course was whispered to James because there’s no way Sirius Black would admit he’s not good at something)