I used to work for he Maryland Department of Housing 10 years ago and a friend of ours just got hired. My brother worked there to.
So, our friend had a habit of leaving his car keys in his desk drawer. Well, on his second day at work the Secretary of the Department of Housing was gone to give his monthly report in front of the full senate. So, his designated parking spot was empty. Well, my brother swiped our friend's keys and I moved his car to the Secretary's parking spot. The best part is that the parking spot is right in front of my brother's window and they were both in the office when I moved it. And, I am 6'6" tall - real difficult to miss!! My brother watched me the entire time while our friend was oblivious to the world!!
So, I called the Secretary's secretary and had her call our friend and chew him out for parking in the wrong spot. It was hilarious! We were laughing so long!!! He turned so red, but did not say a word!!
That was just one of many good practical jokes at that job.