14/08/2014 07:19 BST | Updated 14/08/2014 07:59 BST

This Guy Tried To Prank Two Cops. It Did Not Go Well.

Prankster Jack Vale has come up with a rather neat - and funny - trick.

He hovers around people while pretending to be on the phone - and then, in this pretend phone call, starts talking about the strangers he's hovering around. It's called the 'Making People Paranoid' prank - and it works.

Vale tried this prank at a conference back in February with hilarious results.

But when he tried it recently on two American police officers? Things went slightly differently.

"All I did was describe these cops to someone on the phone," Vale says on YouTube, "and this guy went crazy!"

He most certainly did...