Technology is used in some bizarre ways. When straphangers around the world found out that seven men removed their pants on the New York City subway in 2002, a rapid-fire email campaign started an annual tradition.

Why? I have no idea other than the world is loaded with exhibitionists. Now 60 cities with 4000 folks participate in this Improv Everywhere event. Here are some photos from the most recent event last week.

Buenos Aires

Hong Kong

New York City

Berlin

Bangalore

Kiev