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Simulated colorful vertical lines or expanding black ink spots that mimic internal panel damage.

To ensure the prank is convincing, you need a sharp, high-resolution image that matches your monitor's native 1920x1080 resolution exactly. Broken Desktop - Pinterest 1920x1080 Broken Computer Screen Wallpaper">

Setting this as a friend's lock screen or desktop background is a classic way to give them a brief (and harmless) heart attack. Simulated colorful vertical lines or expanding black ink