My favorite junk food is chocolate - more specifically the delicious substance that is Nutella.
I've recently discovered a local pizza restaurant that makes a Nutella pizza and it is by far the best thing I have ever eaten. I have had dreams of this dessert and am not ashamed to admit it. I talk about it with friends, I try to convince coworkers to order it "to go" in order to share in the indulgence with me, and every time I'm out to dinner down town I suggest that we "just go for dessert."
Right now I'm trying to think about when the next time I can have it is while I type this... trust me, it's that good.