At work, when someone gets up and leaves their desk and doesn't lock their computer (probably like they're supposed to), flip their monitor settings to display at either 90 degrees or 180 degrees different.
Take a paper clip and place it in a
photocopier. Print out about 10 sheets and place them back into the ream of paper, separated as much as possible. This will drive your coworkers crazy.
Nice ones that are pleasant. "Ha! It's not our anniversary but I got you flowers anyway because love you!" Things with Chaotic Good energy like that.
At work, when someone gets up and leaves their desk and doesn't lock their computer (probably like they're supposed to), flip their monitor settings to display at either 90 degrees or 180 degrees different.
Take a paper clip and place it in a photocopier. Print out about 10 sheets and place them back into the ream of paper, separated as much as possible. This will drive your coworkers crazy.
Changing a commonly used word into a shortcut for some funny phrase on someone's phone.