Think I've mentioned before, there's Nigerian Guiness on sale in the exotic food section at Tesco's, apparently most Nigerians don't believe it can be brewed anywhere else -
"Nigerian Guinness is said to be twice as strong as Irish Guinness. In the 1800s, the Irish brewed the Guinness twice as strong, due to a fear of evaporation on the long voyage to Nigeria. However, the alcohol did not evaporate, and to this day Nigerians brew their Guinness twice as strong."
http://en.wikipedia.org/wiki/Guinness_Nigeria