There's some pretty intense security footage of a playground taking a direct hit from an F-3 tornado in Tupelo, Mississippi last week.  It goes from completely calm to CHAOS in a matter of seconds.  Obviously the playground was empty at the time.

 

 

(Search for "Security Camera Footage St. Luke United Methodist Church."  It hits at 1:45, and it's over around 2:20.  NOTE:  There's no sound.)