That
was fun!
I looked at the comments on WSJ and "tart sweet" was the last for a number of people, & mine.
The "V" was also a late entry. Remember Mr Bean? Though his was more advanced.
http://www.youtube.com/watch?v=Sm3_qEMTdc4
I've always wished I could spend a day with a Spectator setter, or other, & just watch how they create these amazing puzzles.