A vintage tractor key, with the matching ignition switch mounted in a rackmount panel next to a usb port and some toggle switches.
https://media.hachyderm.io/media_attachments/files/112/680/197/691/726/396/original/14368211e9bdbe64.jpg
When my computer suddenly starts being weird and ignoring mouse buttons and keystrokes, I pull this Oz looking key out of my pocket and turn the keyswitch. It reruns my xmodmap & xkbset commands from my .xsession startup file.
All fixed.
(This only happens once or twice a year, but it can be such a hassle to fix by hand...)
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