6) Kansas' McConnell Air Force Base takes a beating in this footage of a monstrous EF5 twister in April 1991. The highlight comes in the clip's second minute, when the funnel takes a sudden turn toward the camera and roars through a parking lot just a few hundred feet away. This video shows the same tornado a little later in the town of Andover, where it killed 18 people.
5) Filmed in Ellis, Colo., in May 2007, this tornado was on a mission. The clip opens with a frantic scene — the chasers become the chased as they flee down the highway in reverse — but you can clearly see how wildly it's rotating at several points, especially between the 1:35 and 2:20 marks, when it rips apart a building and several trees.