Basically anything that includes chocolate. A few exmaples include cookies and cream ice cream, chocolate mint ice cream, cookie dough ice cream and vanilla and chocolate swirl ice cream.
Bubble Gum! Especially the kind that has the bits of bubble gum in it. Sadly, it's become harder to find. Birthday Cake is my second and Butter Pecan is my third. Mint Chocolate Chip is also a favorite, but I haven't had it in a while.
Chocolate! Or anything based on chocolate (minus chocolate+fruits, unless it's chocolate and mandarin orange)
Also cookie dough (Ben and Jerry's Half Baked yumm), brownies, mint chocolate chip
I had this interesting ice cream at the Old Spaghetti Factory called Spumoni. Their version was chocolate, vanilla, and pistachio