I don't know if you can get Nigerian Guinness where you are, but that stuff is a very enjoyable gateway to insanity.
It started with a trade embargo, so the Nigerian branch of Guinness couldn't get the necessary barley to brew the original stout. So they improvised, using sorghum and maize and came up with an exotic rocket fuel that is an experience like no other beer.
Nowadays, the demand for it means that the Dublin brewery makes a Nigerian-style Guinness alongside its normal stuff, but although it is a good drop, it is to the full-on African hellbroth what the emasculated Theakstons 'Old Peculier' was under the aegis of Scottish & Newcastle Breweries was, compared to the magic potion it was in the days when the Theakston family originally ran the business.
Lion Stout, from Sri Lanka, is a fine dark beer, although I can't imagine drinking it in the Sri Lankan climate - a recipe for instant unconsciousness if you ask me!