Knock! Knock!

It's not the police knocking hard on your door

It can't be a T.rex cos they are no more

It isn't a postie delivering post

It's not Halloween and therefore not a ghost

It's not Father Christmas (the wrong time of year)

It isn't a burglar so have no fear

It isn't that neighbour you know all too well

It's just the repair man who's mending your bell!