"Buttons to mash randomly"
I once made 2 mistakes at college because I really did not believe the IT department (or hardware manufactures) would be so naive to leave everything open to us students.
The first one, was expecting the "number of copies" option on the printer panel would not to override our 10 copy print limit on our login on the PC printer software. 100 copies later, I guess I found a way for free copies.
The second unrelated one was "format C:" on a stand alone pc... oops.
The third was not a mistake it was a way for us to all play Quake. When the servers asked for our login with "accept" and "cancel" buttons, we just pressed "cancel" and so it dropped to desktop with full admin access... though we obviously had no login... ;)