Pulling emergency stops in front of ANYONE is just stupid.
I hope you report him to the police and you've learned about hitching a lift and be careful that you're never going in a car with him again !!
You, your friend and sis coudl have been injuured or killed.
AND .... nex time you're in a car, that idiot might pull in front of you and casue injury ot death. He might be doing it right now to someone with kids in their car.
REport him. Get the plonker off the roads
"A woman without curves is like a road without bends, you might get to your destination quicker but the ride is boring as hell'