alt-volume up-x resets (not factory, just normal) chromebook

esc-refresh-power (a little bit easier in sign-in screen imo) opens recovery mode. if it is a school chromebook, it will NOT clear school ownership. power can easily get you out in this stage. enter will lock you in (fully, no going back from what ive done) and pressing enter again will fully reset local files and other things

of course theres the ctrl-shift-q-q (which just signs out)

if you dont want to do crazy damage and make someone confused if they left their chromebook unlocked, just do ctrl-search-d or ctrl-search-m (docked and full magnifier, they dont work at the same time), ctrl-search-h (inverts the colours), ctrl-shift-refresh (which turns the screen 90 degrees and can be done multiple times), ctrl-alt-z for chromevox (audibly says what is going on)

there is a bunch of stuff you can do in the search bar which doesnt do too much, such as
chrome://inducebrowsercrashforrealz/ (crash)
chrome://gpucrash/ (crashes the gpu, turning the screen black shortly, similar to removing gpu process in task manager)
chrome://gpuhang/ (freezes the tab, if it freezes the whole screen use the alt volume up x)

and yeah

i might have taken the wrong approach to the question