The worst, the absolute worst has to be the ones that tell you the name of the car:
L123 TVR on a TVR etc etc etc, i mean, these pratts go pay good money for serious cars, then pay another few hundred quid to put the name on the back, which is on the fookin boot anyway!!!!
Another one that gets me is the companys who pay to have a load of vehicles on private plates, say like: Charlie Smith Decorators, and the reg's all read CSD or something, despite the van being a mobile advertisement anyway.
FFS.