How to Prank Someone with a Fake System Update Screen Using Update Faker

Updated

Open updatefaker.com on the person's unattended computer, click the theme that matches their operating system (Windows 10, Windows 11, Mac OS X, Windows XP, or Windows 98), and the site immediately displays a fake system update screen. Press F11 for fullscreen immersion, and press Enter or Spacebar if you want a fake blue screen of death on top of it. This works on any browser on the target machine and requires no install or account; it's designed as a harmless prank, so only use it on people who can take the joke and never on someone racing a deadline.

Step by step

  1. Confirm the target's OS. The site offers separate themes for Microsoft Windows 10, Windows 11, Apple Mac OS X, Microsoft Windows XP, and Microsoft Windows 98. Pick the one that matches the computer in front of you so the screen looks native.
  2. Wait until they leave the machine. The prank only lands if they return to a computer that appears to be mid-update.
  3. Open updatefaker.com in the browser on that computer and click the appropriate theme. The fake update screen starts right away.
  4. Press F11 to maximize the browser window for full immersion. Press F11 again to exit fullscreen mode when you're done.
  5. Optional: press Enter or Spacebar to trigger a bluescreen of death. The site notes this "will really get them worried," so save it for someone with a sense of humor.
  6. Keep a straight face when they come back — the site's own tip is to hold your laugh.

What to expect

  • The fake screen appears as soon as you click a theme; there's no setup screen or countdown to configure.
  • Fullscreen (F11) hides the browser chrome, which is what makes the illusion convincing.
  • The bluescreen trigger is a keyboard shortcut layered on the running fake update, not a separate page.
  • Everything runs in the browser on the target computer, so closing the tab or pressing F11 again ends it.

Exit and clean up

  • Press F11 to leave fullscreen, then close the tab or navigate away to stop the fake screen.
  • If you triggered the bluescreen, the same exit steps apply — it's part of the same browser page, not a real crash.
  • Tell the person it was a prank soon after they react. The site's disclaimer is explicit: "A good prank shouldn't last long, and should definitely not be harmful." If you know someone is working on something critical, relieve them quickly or pick another target.

Staying within harmless-prank territory

The site frames itself as "literally one of the least bad things that can happen to an unattended PC," and its disclaimer warns that pranking a boss, spouse, or parent is at your own risk. Two practical guardrails:

  • Avoid people under real deadline pressure. A fake update on someone finishing time-sensitive work turns from funny to harmful fast.
  • Expect the lesson to stick. As the site puts it, anyone who falls for it "will never leave their PC unattended again" — which is also a good reminder to lock your own machine with Windows Key + L on Windows or Control + Shift + Power on Mac.

If you want ideas beyond the standard update screens, the site invites suggestions for new fake screens, so the theme list may grow over time.