Vzzbux

Eddie: Right. Ironmonger.
Richie: Hmm. How many letters?
Eddie: Er... ten.
Richie: Right. What does it begin with?
Eddie: Well... "I".
Richie: Well write it down then.
Eddie: No, "ironmonger" begins with "I", that's the clue.
Richie: So put it down!
Eddie: But there's only room for six letters!
Richie: [thinks] You'll have to spell it wrong.
Eddie: All right... Er, "V"... "Z"...
Richie: So what have you got?
Eddie: "Vzzbux".
Richie: Good, good start. Good. How does that help us with two down?
Eddie: Erm... all right, two down... erm... "Fish", four letters, now
begins with... "X".
Richie: "X"? ...Xylophone, xylophone fish.
Both: [think] Nah, it'd sink, wouldn't it.