This extraordinary video will cause you to catch your breath – and hold it for its 55 terrifying seconds.
But don't worry: it ends happily.
It shows a baby crawling across the floor of a parking garage as a family pile into the car and get ready to set off.
The car revs up and then starts to reverse and as the seconds tick by, the baby crawls straight into the path of the vehicle - which then DRIVES OVER the oblivious infant before the horrified driver realised what had happened.
Story continues after video
Mercifully, the one-year-old survived, although did suffer some minor injuries.
The astonishing scene was captured on CCTV in Brazil and posted to the website LiveLeak.