On the back windscreen of a MINI I recently saw....
"You were only supposed to blow the bloody doors off"
(Quote from The Italian Job - Michael Caine)
It brought I smile to my face, as I sat in a hideous traffic jam.
I'm trying to think of something witty for the GTI.
(I saw "my other car is a Porsche" sticker on a 911 once!)
Any ideas?