Eww! Who wants candy that tastes like a cat?
I’d like Mexican-style M&Ms with a hint of cayenne.
That was so unexpected I laughed out loud at work. 
Bacon.
Seconded!
The last time my Mom went to the UK she brought me a Marmite flavored chocolate bar. It was delicious! I fully expected to like it, but it was far better than I anticipated. Chocolate and Marmite really go together unbelievably well.
Then my job here is done. On, Faithful Steed!
Watermelon
Pineapple
Sirloin steak
I’d settle for just being able to get the American flavours. I have to stock up on dark chocolate and peanut butter whenever I’m over there.
Similarly, I had some wasabi beans the other day. Same comment. The surprising thing about them is that the initial burn is really intense - like freshly-made English mustard, including the fumes-up-the-back-of-the-nose sensation - but it vanishes without a trace in a couple of seconds. It reminds me of the description of a taser: it really, really hurts until the current is shut off, then there’s hardly even a memory left.
Tabasco M&Ms would be awful. Too much vinegar.
I would like to see M&Ms with candied orange peel in the center - preferably dark chocolate.
I put Tabasco on Hershey’s chocolate bars. Tastes great.
I don’t know if they’re still around but M&M’s premium line had coffee among the flavors. I loved them, but I think I was one of the few. Haven’t seen them in a while.
And I agree, a coffee flavored cereal would be great! Especially if it was caffeinated, I could skip a step in the morning. 
Macadamia nut. French vanilla. Or both.
Beef jerky.
Cinnamon
Black Cherry
Brown Sugar
Molasses
Canada had a Cinnamon Kit Kat for a while (maybe they still do?) It was… uh… not my favorite…
You are my new best friend.