Good one, Countess-
I'd have Julia go and buy a whole bunch of red notebooks that were identical to the one she had in 1967 (which detailed the scandalous truth about Barnabas). Then I'd have her gift one red notebook (filled with dessert recipes) to each member of the household. Once Barnabas came to Collinwood and saw Roger, Elizabeth, Maggie, Mrs. Johnson, etc., each toting around that notebook, and heard them say "Great book! Can't wait to really use it!", that would be one classic April Fool's joke, Hoffman style.