To try not to say something crazy:
Blimey, isn't that a bit dangerous slamming on the anchors with a tail gater? What if they'd gone into the back of you and your head fell off? I suppose you get... your repairs for free? Increased insurance premium if you tell your lot? Not sure what else you get... a vauxhall corsa courtesy car I suppose, always good to drive other cars.
What if he/she had swerved into a hat/child/bike on the other side of the road that apparently most road users can't see/your best friend who likes to walk along the kerb but is short/long-sighted?
On a less being-a-bit-silly note, the whole thing about "well it'll be their fault!" or "well it's your insurance not mine!" or "listen she was alive when we started!" all seems a bit crazy to me. In my opinion, i'd just get hassle, a car that'll 'feel' different afterwards and maybe a new squishy noise when i move my head left and up a bit. Oh also i'd be late for the interview/relative visiting/doctors/petrol station. So even though it 'was her fault!' I think i'd still feel like a horse that had won the donkey olympics.
Actually i'd feel worse, as if I were the horse, i'd be feeling guilt (at cheating) but also maybe mirth (because the idiots didn't realise I was a horse, I mean come on, we're built completely differently, and I look good, those donkeys look stupid as!) and perhaps elation (as I hadn't got caught being a stupid idiot doing stupid idiot things that are pointless and won't teach the silly donkeys anything anyway).
I think I have clearly expressed myself here!