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Around 1986 I put together a "screensaver" for Sun gear that made the screen look like it had a couple of bullet holes in it. I occasionally deployed it on workstations where the user (engineer) had walked away, leaving himself logged in. Quite realistic on the colo(u)r Trinitrons of the day ... realistic enough to draw many a scream of "What the FUCK‽‽‽‽" from people who should know better.