Workzone: Mom pranks son with terrifying stuffed animal

Jessica Mags bought a unicorn toy for her son, but didn't tell him that it had one special feature: if you squeeze it in just the right place, the face of the unicorn changes from adorable and sweet to menacing and downright terrifying. 

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Jessica's son's reaction is priceless:

The poor boy had no idea what was coming! Of course his mother didn't mean any harm by it - but her son's reaction was surely worth the money spent on the toy?

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Could this be the beginning of a beautiful mother vs son prank war?