Tried maple in a beer once. Couldn't tell it was there at all. Should've saved it for pancakes or made some Warsaw Waffles.
Did figs in a BDSA once. Not sure where they ended & the Special B began, but it was tasty.
Cinnamon. It should be on tables in restaurants along with salt and pepper. Anytime someone says, "Ooh, this is so good - what's in this?" the answer invariably comes back, "cinnamon." Cinnamon. Again and again.