How it happened:

Driving to a halloween party (of course)... go through a stop sign on campus and hear sirens behind me. So I look up in my rear view mirror, and see an ambulance approaching. Like a good citizen, I signal and pull over to the side of the road. Guy behind me? NOPE. BLAMMO... wipes out my rear end, and the front of his car goes UNDER my car... destroying my exhaust, driver quarter panel, trunk, and suspension.