Go into the office and waste every resource you can.
Plug in a fan + heater + aquarium + massage pad at your desk and leave everything on constantly even when you leave
Print every email and throw it in the trash.
Make coffee 50x a day and pour it down the sink
Flush a whole roll of TP every hour
Leave sinks on in the bathroom
Use entire tubs of soap to wash your hands
Turn on the microwave for hours at a time
Heat/cool office thermometer to force HVAC into overdrive
Open new browser windows until your computer crashes and repeat until the network goes down
Company wide meme emails that everyone participates in (team building) that crash servers and dominate inboxes
Pour sugar/crumbs everywhere so there's pest problems
Accept every phishing email
Put USB sticks found on the ground into your work computer
Open the door for strangers who want to get in the building without a badge
FORM A UNION
(nuclear option) introduce bedbugs to all your bosses offices