It's called a high pucker factor, for reasons that will become readily apparent
Start with a 24 oz tumbler, and as much ice as you feel like (or a 32 oz if you like a lot of ice)
12oz 7 up (or halfway with the ice, to make it stronger)
4oz Dekuyper Sour Apple Pucker
4oz lime juice
4oz of Bacardi 151
I think you can see why it's called a high pucker factor. We mixed it up as a joke after an ... incident ... involving entirely too much of the aforementioned spirit, some unlawfully acquired government property traveling at a high rate of speed, and various scantily clad females of questionable moral persuasion.
Oh and if you dont get the inside joke, what the hell are you doing reading me? Not that I dont want you as a reader, I'm jsut wondering how on earth you managed to find me.
It has variations:
Substitute Vodka for a "Fucking James Bond Motherfucker Pucker Factor" (another inside joke)
Substitute Tequila for an "MFF pucker factor"
Substitute Gin for "The full english pucker factor"
Oh and when in the presence of anyone who has spent 13 weeks of fun in the sun with a gun, peach liqueur must be added for the "Huah pucker factor"