I read about this in the Observer at the weekend, where a bunch of activists dressed in V For Vendetta masks "Rickrolled" the London HQ of Scientology.

I found this on the internet by way of explanation. Rick seems like a pretty decent chap and seems to be taking it all in his stride.

http://latimesblogs.latimes.com/webscout/2008/03/rick-astley-kin.html