I think if Pepsi were to make a drink that's half-Mountain Dew/half-Diet Mountain Dew, that might just usher in an era of peace for all humanity. Whenever I get a fountain drink, that's usually what I do. Well, it'll actually be more 80% Diet Mountain Dew, with that 20% of regular Mountain Dew just to get the blood sugar levels kicking. It's actually pretty good. Ok, that's all. Peace be with you.
You can always make your own weird combos. Hell, Mountain Dew did it by combining their red, white & blue Dews into the slightly grapey Dew-S-A, which I actually like better than any of the three flavors that went into it. We used to have Glen Rock sodas around here. Smallish, maybe 20oz bottles that you could pick whatever flavors you wanted and make up a case. We mixed a lot of really strange flavors together. I want to say there's a restaurant nearby that has a "all flavors from the fountain" mix that was pretty bad.