A man moves into a new flat and invites a few of his friends around for a housewarming drink. He’s got lots of lovely furniture but then one of his friends sees an old hammer hanging on the wall and says, “What’s that dirty old hammer doing there?”
The man replies: “Oh, that’s not a hammer, it’s a talking clock. Look, I’ll show you.”
So he picks up the hammer and starts banging it against the wall, whereupon a voice comes from next door shouting: “Keep it down in there, it’s almost half past ten!”