Flashmob + Rick Roll = Rickmob

http://www.youtube.com/watch?v=3seKeKh5Jzc (small clip but better audio quality than others)
http://news.bbc.co.uk/1/hi/england/london/7343833.stm
http://londonist.com/2008/04/rickmob_when_in.php

Excerpt from the Londonist...
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What is Rickmob? First of all, you need to know Rick Astley... Then you need to know the bizarre but sometimes hilarious phenomenon of Rickrolling on the internet. And then refresh your knowledge about flashmobs and the variations upon a meme.

And then you need to imagine all those elements colliding on the concourse of Liverpool Street station on Friday 11 April at 6pm. That's right: an entire train station is going to be rickrolled. Makes your eyes water, though that could be the effects of the high note in the first verse.
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This is, also after the New York Mets got RockRolled in a huge way.
http://www.news.com/8301-13577_3-9914423-36.html
http://www.youtube.com/watch?v=F0VJZMxode4 (Mets fans NOT happy)