Could this be the hardest slap ever?

We do this sort of thing when we're kids at school, and I'm pretty sure most of us boys did it when we were in primary school.

Three students do the same thing but they're a lot older and they get the fright of their lives when it backfires on them.

See: Backwards truck pranks that will leave you in stitches

After pulling a girl’s fake ponytail, which falls right off, she stands up and unleashes fury in the form of a titanic slap.

It's the best slap in your face you'll see online...