In case you haven't heard the term flash mob before here's the citation from wikipedia:
A flash mob is a large group of people who assemble suddenly in a public place, perform an unusual action for a brief period of time, then quickly disperse.
Now someone came up with the concept of a freeze flash mob, meaning everyone gathers in a public place and just stops moving for a couple of minutes. You can see how much fun it is to see people wandering around totally clueless of what's going on in this video taken in London:
I got an invite on facebook to join a group for an upcoming event in munich. If I'm in town I am definitely going to be there! Here are the raw details from the group page, in case you're not on facebook:
Friday, May 9 2008 exactly 14:15:00 to 14:20:00
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Location: Marienplatz