In the interest of multiculturalism, instead of the beer based xenophobia that seems to be going on here I will pick three from different countries, in no particular order because they are all very good:
Mythos (Greece)
London Pride (England, also only if you get it in London, it doesn't travel well!)
Kingfisher (India)
I tried to pick reasonably well known ones, there's no point picking my favorite local microbrewery contribution because nobody will know what it is!
To people suggesting things like Amstel, Heineken, Bud, Miller etc. Bad Dog, get in the yard! All lagers like that are utterly interchangeable, don't get me wrong, I like those beers (except Heineken) they are perfectly easy to drink but they are no the best.