South Australian police are investigating after a passenger recklessly kicked their legs out of a car moving at over 100km ... dangling from the rear window of a burgundy 4WD with P-plates.

"Let me break it down: Open your car window on the way to work once a week and toss out a $100 bill. That's what driving a new car really costs you." Trending: Invest in the Future of Digital ...

More info Boris Johnson has been captured on camera squawking in pain as he's bitten by an ostrich through his car window ... the video saying it was "too funny" not to post.