Quoted from PinballNewb:
+1 for Sour Skittles.
I like 'em, but too many and they start to tear up the inside of my mouth. Sour Patch kids too. Switch back to regular skittles when that happens.
Very happy/surprised to see Circus Peanuts at the top of this thread. I love 'em, family thinks I'm crazy, but wife finds bags at the Dollar store and loads me up. I don't care if orange vs blue vs green.
But best is Jelly beans. Jelly Belly, Sweet Tart, Now and Later, all make tasty flavored beans.
I'll add Chewy Sweet Tarts here as well, since I haven't seen it above.