Don't point it out yourself. Let them sit down and discover it naturally.

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: A timer or a "locked" browser state creates a sense of urgency, discouraging the user from thinking critically or seeking technical help. JustAnswer From Malware to "Prank" The origin of this screen isn't humorous; it began as Ransomware

: You load a specific webpage or image that mimics an official government warning.

A normal webpage with a URL bar at the top spoils the illusion instantly. You must hide the browser interface to make it look like a system-wide lock. Press F11 . On Mac: Press Control + Command + F .

Do not execute this on a work computer or a corporate network. IT departments have automated monitoring tools. A fake FBI screen might trigger an expensive, company-wide cybersecurity lockdown and get you fired. 4. Reveal the Joke Quickly

Enabling a fake webcam feed box to make it look like the "FBI" is recording them.

: By using the official FBI seal and Department of Justice branding, the prank triggers an immediate "fight or flight" response. The Specificity of the Crime