Mouse Jiggler 2.0
More than 10 years ago, we had a very specific case where we needed a computer to remain unlocked - despite activity on the computer, a weird configuration was keeping the activity from being detected. As a result, the computer would lock and unlocking it would take a lot of manual effort.
On a whim, I printed out black and white "noise" and glued it to an external fan. Then I (crudely) wired the external fan to be powered over USB. It was crazy - but it worked.
Fast forward 10 years, and I'm seeing actual "Mouse Movers" and "Mouse Jigglers" all over Amazon that are designed almost identically (albeit theirs look much nicer...)
I missed my calling...