Who knew there were so many varieties of Pepsi past and present?
In the Asia-Pacific region alone you have (or had) Pepsi A-ha, Pepsi Fire, Pepsi Ice Cucumber, Pepsi NEX (developed by Suntory for the Japanese market), Pepsi Samba (which flopped in Australia), and Pepsi Cafe Da (sold in Vietnam).
Then there's Pepsi Max (a diet version sold outside the U.S.) and Diet Pepsi Max (sold only in the U.S., with a completely different formula than Pepsi Max)--neither of which is to be confused with Pepsi XL (a "mid-calorie cola targeted at males and transition customers" who are making the switch from regular to diet soda).
Befuddled yet? We're just getting started. Pepsi plans to introduce 12 new formulas sometime this year, including Pepsi Natural, made with cane sugar instead of high-fructose corn syrup and sold in glass bottles only.
Scroll down the Wikipedia entry linked above to see listings of fictional and parody Pepsi varieties, including Pepsi Perfect (from Back to the Future), Poopsi (from the animated series Doug), and Pepsi B (an "export-only" B-grade Pepsi given to Apu in the "Eight Misbehavin'" episode of The Simpsons--thanks to Dave at 5 Blogs Before Lunch for telling me about it).