Ya can't have a rum and Pepsi. The flavor of Coke is unique. Anything else is just a cola. Having said that though, for reasons of certain "affiliations" I guess you could say, Pepsi seems to be the dominant flavor in NY-area pizza shops, and I don't mind a nice cold Pepsi with a good hot slice.
“I never lie because I don't fear anyone. You only lie when you're afraid.” ~John Gotti
