I heard rumours that you can add alcohol to this but I've won't be testing that theory for at least 9 months.
2 liters Sprite
2 liters no-name mango fruit punch
2 liters rasberry sorbet
2 bananas, sliced
2 cans of pineapple
Some strawberries, sliced
Nothing too hard. Just mix everything together in a big bowl. I recommend putting the sorbet in before adding the fruit so that you can mash it up a bit without squashing bananas (I realized this after). You can also let the sorbert float in the bowl acting as ice (but then people might like "What's that weird chunk all about?"). This recipes makes a lot so you may want to half it if you don't have so many people.