Some people love driving and dealing with turns/curves in the road since it can test traction and usually have some fun with oversteer, which I am pretty sure is when the car's ass can stick out when you're turning. It's pretty difficult to do unless you know what you're doing and I'm willing to bet the guys doing it are just trying to show off and be stupid. I would give them another hour at most before you call. I wouldn't let them develop a habit though. If only we had some poisonous mist for them.