Ive backed out quite a few situations, i find that most people are doing it to prove that there polo/Xr2i/corsa is the fastest thing in the world with there 6" exhaust or to just annoy me. They seem to like driving within an inch of my rear bumper even in traffic. Ive had fun with a few mercs including an AMG ML, New Golf GTi, Impreza's, TT's, BMW's etcc.. but the main one was a Porsche 911 turbo across some open country roads, which i kept up with. To be truthfull if the situation came up again, i wouldn't bother. I admit, i do drive quickly, but i make sure i stick to the limits in built up areas, similar to what we did on the NW run. And to add to someones comment earlier, i've never done it to look cool as i try to do it in areas where there are few, if any pedestrians at all. Time and a place and all that.