Flash Mob + Rickroll = Rickmob!

FlashMob
A group of people, typically students, will arrive at a designated public location at a specified time, and perform an inane act synchronously, and then abruptly leave.


_{The London Splashmob in Hyde Park}

Rick Astley
King of the Universe. Rather famous for his 80's pop hit Never Gonna Give You Up.

RickRoll
Being directed to a certain place on the internet, but instead finding yourself taken to the above video. Apparently, watching 'Never Gonna Give You Up' is something to be avoided...but I actually visit that link without provocation, just for fun. I love Rick Astley.

RickMob
Hundreds of people, at Liverpool St. Station, all singing Never Gonna Give You Up. How did I not manage to find out about this in advance? How did I miss this momentous and life-changing event? I could cry.


_{The video's pretty poor quality, I admit, but the best I could find}