"Lui ci sta nella macchina."
C'mon, This is ridiculous. He fits in the car? Really. I'm getting very discouraged with this
Maybe he is a very obese man? Or the mafia is shoving someone into the trunk of the car? Or maybe the man is trying to fit into a FIAT?
Sure! In the sense of being part of something, like I'm in!: "Vuoi scrivere un libro con noi?" "Ci sto!"
Or even as a fit: "Papà, tu non ci stai nel letto piccolo!"