That's quite simple, you just need to remove the polarized layer from your computer screen and use new polarized sheets to make polarized glasses out of 3D glasses for example.
Only the person wearing the special glasses can see what's on screen, others will just see a blank monitor.
Better try that first on a used monitor you don't care about though...
Another fun video from now famous magician/prankster Stuart Edge.
He said that as crazy as it may seem, it's not fake. He also said that he would upload a video explaining how they did it
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