Reese's Peanut Butter Cup: whole thing mouth
Double Stuff Oreo's: I take two and pop one cookie cover off each, combine to make quadruple stuff. Yup write that down.
spaghetti: I don't roll/twirl on the spoon like you're supposed to. Just roll/twirl on the plate.
Spin Pizza: I pick it up. I see lots of people eating with knife/fork but that's just not for me.
Lucky Charms: At first I just eat it normal, taking scoops with both the 'mallows and the cereal bits. As I get towards the end where there's only one layer of cereal floating on the milk I make sure each scoop has at least one 'mallow. Then the last few dreadful scoops are all cereal bits. Also I found this:
http://lunaticoutpost.com/Topic-Lucky-Charms-Breakfast-Cereal-ConspiracyBurgers: I pick them up with two hands, thumbs under the bottom bun, so the sesame seed side is on the roof of the mouth. I see some people eat them upside down, otherwise I wouldn't find it necessary to even add this one.

Skittles & Gummy bears: segregate into colors. Eat in order of going from favorite to least favorite. Sometimes I give the ones I don't' like (yellows) to unsuspecting fools who might find me generous.