Storm chasers use heavily modified trucks called tornado intercept vehicles, or TIV-2 for short, that are designed to withstand whatever the weather throws at it. This is what it's like to be inside one during a seriously scary tornado.
This footage is from a tornado that struck over eastern Smith County Kansas yesterday. Wind speeds are rated at 150 to 175 MPH, making this an EF3 or EF4 tornado.
The footage inside the truck is truly amazing. It looks like the cone of the tornado goes right over the top of the truck, in a moment that would be pants-shittingly terrifying for an average person, and I'm sure pants-pissingly terrifying for even an experienced storm chaser.
(Hat Tip to Bill!)