Not the usual joke perhaps, but I found this really side-splittingly funny.
Some idiot has posted in "Insurance" section that his car caught fire and will probably be a write-off. However, he took out insurance on his car, and then without telling ins.co. changed the registration number to personalised one (otherwise known as a country member (courtesy of col craddock)).
He is now complaining that the Insurance Company may refuse to pay out! Just how could someone be so stupid?