for people that dont know, a paddywagon is like a van with a bench in the back. They handcuff you and make you sit on the bench. Nothing is keeping you still on that bench, though, so if they drive hasitly and make sudden turns you're sliding up and down that bench just trying not to smash your face on the walls. Then they yell at you to sit still !
I think they do it on purpose
One time when my brother was taken in for questioning but not arrested, he hid his bag of weed in the cop car, and got it back when they drove him home