Escape+Reload+Power Button will do a factory reset…ummm….

Ctrl+Shift+Alt+R is another way to log out your friend’s chromebook 

(Ctrl+Shift)+Q x2 this will log them out of there chromebook

Ctrl+Shift+W will close the entire window 

Ctrl+Shift+6 will do a break sentence and be very obnoxious

Ctrl+Switcher/F5 and spam it which will take a screenshot and if you spam it , it can be very annoying filtering through all the files and it will slow down their chromebook.

Search+ Alt - Turns on caps lock , and most people are unaware of the shortcut so they will forever be yelling. 

Ctrl+alt+z will annoy your friends in the most passive-aggressive way possible by highlighting their text and reading it back to you. 

Cntl+search+m this magnifies the whole screen