With Calypso cups, the cool thing to do was to ditch the straw, bite the bottom corner of the container open and then drink it through that. At least it was at my school. Most supermarkets still have some variant on them, and they still taste absolutely awful if you're no longer a child.
I miss black cherry Crusha being widely available. You can still get it, but it tends to be more of a Makro/Costco thing now. It is my favourite flavour by miles and miles.
I miss Rowntree's black cherry jelly also. On the very rare occasion's at my nan's house when she hadn't cooked or baked some kind of masterpiece, black cherry jelly was the back up dessert and it was beautiful.
Lastly, the same thing I mention every time this thread comes up: I miss Pepsi Blue. The garish colour, American oversized bottles, the 100% unnatural taste, the blue stained mouth it left behind. It was the worst sort of soft drink imagineable but I have never had an addiction like it. In fact, maybe it's a good thing it was a commercial failure because I'd most likely be fat and toothless by now.
I think what also made it special was that it was never successful and didn't get European distribution, so you'd only find it in odd corner shops or the occasional case at a place like Home Bargains where they'd occasionally have weird stock in because it was presumably cheap. After it got officially cancelled, finding the last few UK reserves of it in obscure locations was magical.
According to Wikipedia, the only places it's still sold are certain parts of mainland Malaysia. Weird.
Rest in peace Pepsi Blue; the world was not ready for you.
Oh, and during my recent trip to Amsterdam I enjoyed Chocomel and Blackcurrant Fanta which you don't get here, but they're both widely available outside of the UK.