21.   Oh, I know the one!

22.   I know the one you mean.

23.   You know the one with the ginger hair?

24.   No, you know that one.

25.   You know that one on playgroup?

26.   Maybe you know that one, cos he got the sack.

27.   I think I know this one.

28.   Mutty might know this one as well.

29.   I know the one you mean though.

30.   Do you know that one?