Twix: eat the cookie part from the bottom first, then eat the remaining caramel whole (like a giant Rolo)
M&Ms: eat by color until I have the same number of each color; then eat one color at a time in twos
Oreos (now): dunked half in milk until barely above disintegration, eat that half, repeat with other half
Oreos (as a kid): take tops off two Oreos and eat them, then mash the remaining two cream-topped halves together and make my own double-stuff Oreo (sometimes I did this two or three times, creating a triple- or quadruple-stuffed Oreo)
Kit-Kats: each wafer, layer-by-layer
Pringles: lick off the powdery flavor-coating first, then eat the chip
Chocolate Cherry Cordials: (it is kind of embarrassing how involved this is; it was one of my favorite candies as a kid, so I found a way to realllllllly prolong the eating process) bite small hole from the edge, suck out the cordial filling (leaving the cherry), bite off and eat the flat chocolate bottom, eat the cherry, eat the rest of the chocolate
Corn: going left to right, eat around (not across) the corn in a series of circumferences (there's probably a better word than circumferences, but I can't think of one) (also, how people eat there corn is a frequent topic at family barbecues... are you a typewriter, or around the corn, or a mix of both?)

(Wow, the above list makes it look like I eat a TON of junk food. I really don't; maybe it's because I eat it so rarely that I have these strange rituals.)

Other strange food habits/preferences:

What about you? Do you have any strange food habits/preferences?