Rear Light

A policeman stopped a motorist and asked him:

'How long have you been driving without a rear light?

The motorist jumped out of his car, ran to the back and burst into tears.

The policeman, seeing he was obviously very upset, said sympathetically:

'Now there's no need to get upset. It isn't all that serious.'

'Isn't it?' cried the motorist. 'Then what's happened to my caravan?'