Mountgay Rum, Barbados. Just lovely.
I'm really a Scotch man these days, single malt for preference, but I have a bottle of Mountgay in my cabinet (erm, and some Morgan, too - I'm pretty catholic in my tastes). There is an enormous range of rums, some of them as fine as whisky.
Then, of course, there's Bundaberg, as mentioned previously, which can just about be drunk with a cola of some description but which, particularly in its OP (overproof) and XOP (guess) forms, is really just one step from finding yourself a cardboard box and a bottle of meths.
I've done Bundy. I even got a bottle (engraved, believe it or not) for my 21st birthday.