Right. A joke's never very funny when you have to explain it. But if you don't understand a word, then it's not funny at all. So here goes:

In British pre-decimal currency, a bob was slang for a shilling - one twentieth of a pound.

The Boy Scouts and their younger equivalents, the Cub Socuts - usually abbreviated to "Scouts" and "Cubs" - used to devote a week to carrying out odd jobs for householders in return for a shilling for Scout funds. This continued to be called Bob-a-Job Week, even though the amount of money donated gradually went up until eventually the practice of encouraging young boys to knock on strangers' doors was scrapped.

So.

The policeman thinks the drver is reporting that he's run over a kerb (or curb, in the U.S.).

He is, in fact, reporting that he's run over a small boy who was out doing good deeds. "I've just run over a Cub ... and it's Bob-a-Job Week, too."


Whey, yer bugga! Ah'll have ter gan fer a lie-doon, noo!