Recently, a group of people who called themselves "Flash mob" appears in the streets of Hangzhou for "special parties". The behavior of them has become a special and beautiful scenery in fast-paced city life.

When the music is on, a group of people who are unacquainted with each other would get together for dancing and hug; and when the music is off, they will leave quickly, and seems nothing crazy happen at all. Near the front gate of a shopping mall in Hangzhou, "Flash mob" is dancing together on Sept. 8.

"Flash mob" is dancing together on Sept. 8. Near the front gate of a shopping mall in Hangzhou.

"Flash mob" means a group of unacquainted people make a deal on theme, time and place for their activities through network and short messages, then to active exaggeratively together. Such activities are so short that leave no time for other people to response.