Just signed up and I'm loving the site.
I'm not sure on the memetic status of this (because it started as an ad) but the "I am" rants were crazy. Started as an ad but quickly gained traction with local groups and spawned hundreds of variations/deviations.
https://www.youtube.com/watch?v=BRI-A3vakVg
The Original commercial
https://www.youtube.com/watch?v=ySRf8m3plrM
The Quebecois spoof
http://en.wikipedia.org/wiki/I_Am_Canadian
Was interesting, to me, due to the cross-polanlization across YouTube and e-mail and main-stream media. But I'm curious as to the definition of this type of phenomenon.
Google trends shows how localized it was.
http://www.google.com/trends?q=I+am+canadian&ctab=311068288&geo=all&date=all