I saw a less specific version of this thread on the beer talk forums and would be interested to hear a Canadian version of it. For me, it was Unibroue's Maudite in 2003. I was a typical UK lager drinker who branched out into occasional cask ales and bitters for a laugh every now and then, until I visited BC for the first time in and picked up a random bottle of it along with some lagers- a complete impulse purchase based on the 'insane' (devil grinning at a flying canoe?!) label and 'insane' ABV. It completely floored me - was very difficult to drink the lagers after that but I did so as fast as I could so I could get more of these crazy quebec beers. 9 years later, and I still love Unibroue. Merci Quebec!