Did you know about flash mob?
Actually, I just know about this thing from my friend last 4 days. What can I say, it's awesome.. my friend told me about flash mob..

"Generally, there's an organizer who communicate and announce to public about where & when they will held the flash mob via email, sms, phone or other method. And they'll also include the tutorial of the dance that they'll do on that day"

Cool is it? You don't know each other, but meet together in one place, same time, and dance together? Really cool.. Then I check the exact meaning for flash mob on Wikipedia site

"A flash mob is a large group of people who assemble suddenly in a public place, perform an unusual and pointless act for a brief time, then quickly disperse. The term flash mob is generally applied only to gatherings organized via telecommunications, social media, or viral emails. The term is generally not applied to events organized by public relations firms, protests, and publicity stunts" Wikipedia

Wanna know more about flash mob? View this cool moment