A teenage girl is talking to her father about her new boyfriend. 'He told me something I don't understand,' she says. 'He said I have a beautiful chassis, two lovely air bags and a fantastic bumper.'
'Well,' her father replies, 'you tell your young man if he opens your bonnet and pulls out his dipstick to check the oil, I'll give him a full service so that his starter motor will cease, his pistons will stop firing and his exhaust will drop off.'