Last week, during a Kansas Jayhawks' basketball game, a section of the crowd surprised the rest of the crowd by simultaneously breaking out in a choreographed song and dance routine. They call this a flash mob, and its goal is to both confuse and entertain. Keep reading for some of our favorite examples of this coordinated phenomenon.

This food court flash mob brought Christmas cheer.

Improv Everywhere confused travelers in New York’s Grand Central Station by simultaneously freezing in place.

Oprah’s entire audience surprises her by going flash mob.

A thousand people took part in this "Glee"-themed flash mob in Seattle.

More dancing in this flash mob at The Ohio State University's student union.

This 300-person flash mob in Sweden paid tribute to Michael Jackson.

They do flash mobs in England, too.