Once in a while, I am afflicted by ‘Accidental Caps Lock On’ syndrome on my Happy Hacking Keyboard. This does not happen often but when this happens, I had already forgotten how to toggle the Caps Lock off and re-search how to do this every time.
To put an end to this pointless search, here’s how to toggle Caps Lock on and off on Happy Hacking Keyboard: Press
Shift + Fn + Tab.
Source: WM×LI: HHK での Caps Lock の切り替え．
I’m still wondering what’s causing me to press this key combination (like once in a blue moon).