You gotta hand it to Tesla CEO and Founder Elon Musk. When he puts an actual "Insane Button" in his new Model S P85D all-electric car, he does not mess around.

Unveiled last October, the $120,000 Tesla Model S P85D can park itself — and, with the push of one crazy little button, shoot from 0 to 60 mph in just over three seconds. At least that's what we were told.

Just experience 1G acceleration in new Tesla Model S P85D. 0-60 in 3.2 sec. — Andy Fixmer (@AndyFixmer) October 10, 2014

Now we have proof. The drag racing site DragTimes produced and posted a video on Sunday showing unsuspecting passengers reacting to the twin-engine P85D's ability to hit 60 mph and higher in just a few seconds. Passengers curse, look sick, freak out and sometimes pay the price for not paying attention. One young passenger lost control of her smartphone when the car took off and it went flying into the back seat.

The driver in the video, Brooks (he didn't want to give his full name), told Mashable that he owns the Tesla and drove family and friends.

The Tesla Model S P85D's "Insane" mode button. Image: DragTimes

He provided a picture (above) of the "Insane" button, which appears on the Tesla's huge dashboard screen. And he vouched for the safety of the mode, even though the passengers' reactions in the video make it look like the car is almost out of control. First of all, you do have to put your foot on the gas and push all the way down. The difference with Insane Mode is that it applies the full horsepower of the electric car's two motors (691 horsepower) all at once.

"It's very safe, the car has all-wheel drive and is very stable the entire time. We've even done 0-60 in 3.3 seconds in the rain with no tire spin at all," Brooks wrote in an email.

To put the P85D's performance in perspective, average sports cars can go from 0 to 60 mph in just under 6 seconds. Some Formula One race cars have been recorded accomplishing the same feat in 1.6 seconds, according to Zeroto60Times.

The new P85D, which is available now, is still impressing on the race track, too. According to DragTimes, it recently beat a Hemi V8-powered Dodge Challenger Hellcat and was named the world's fastest production electric car.

The whole thing does make one curious: Is there an "Insane Button" in any of Musk's SpaceX crafts?