Skittle: must eat 2 at a time, same color, one on each side of my mouth. I like to keep a set of red or purple for last since those are my 2 favorite flavors. Any singles I usually give to someone else.
regular M&Ms: same as skittles, 2 like colors at a time, one on each side, pawn off singles.
peanut M&M: This one is tricky. must match color and approximate size. Have to have both sides of my mouth even. Have done this since childhood and headed toward 50 and still do it.