Your heart will literally stop when you see this video...

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But it will start beating again when you see how it ends. Still, all parents can most certainly learn an important lesson on public transport safety when travelling with kids after watching this.

It's a mother's worst nightmare. You're stepping off a train, your child is right behind you. You hear a blood-curdling scream and when you turn back to see what's happening, your child is slipping out of your sight between the gap of the platform and the train, right on to the train tracks.

Watch this video from East Melbourne, Australia, posted by Romeo Masian on his Facebook page. And yes, it has a happy ending, but a very strong warning to all parents: never take your child's safety for granted and always walk behind your child, especially while using public transport.