Best thing ever: Kettle Corn. The kind you buy at carnivals and stuff, much better than the microwave kind (although that will do in emergencies.)
Here in Germany at the Christmas Markets you can get Mandeln - delicious honey roasted almonds.
In general though, I eat Pringles (Salt and Vinegar or regular), cookies, other assorted junk food.
My favorite snack used to be Rold Gold pretzel sticks dipped in my homemade mixture of chocolate chips and peanut butter, melted in the microwave. Delish, but probably not so good for me
