Because Bad WiFi Shaders makes Minecraft look like a compressed video with a bad internet connection, it works well for pranking friends either over a live screen share or on a shared computer.
Faking a Bad Stream Over Screen Share
1. Enable Bad WiFi Shaders in Options > Resource Packs before you start sharing your screen with friends.
2. Join your world or multiplayer server and stream your game window as normal.
3. Look around at different blocks whenever your friends are watching. The moving blocky pixels and blurred colors will make your game look like your stream bitrate has collapsed, even while your voice chat and actual gameplay remain completely responsive.
4. Open Options > Resource Packs mid-call and remove the pack to instantly clear the screen for the reveal.
Sneaking the Pack Onto a Shared Setup
1. Before handing a local world over to a friend, add Bad WiFi Shaders to the Selected Resource Packs list and click Done.
2. Unpause the game so they sit down directly to the funny, broken screen without seeing the options menu.
3. As soon as they move the mouse to look at nearby blocks, colors will blur and blocky pixels will shift across the view.
4. Once the prank is over, move the pack back to Available in Resource Packs.