when I turned 4 decades at the office, mw co-workers had the usual black cake and kinda ‘gothed’ my office. The crowning touch was a remote control fart soundbox. They were ingenious in that they partially disassembled my chair, inserted the device, then put it all as before. All day long, especially when I was on the phone, or when a client (my secretary briefed them when they arrived)they all pretended not to hear the nuclear blasts of heinous grossness. It drove me nuts! I am deaf in one ear so couldn’t get a direction where the box was. When they couldn’t stand it anymore with tears in their eyes from laughing at me searching around the office for the source of the sound, they finally relented and removed the box. I still have it around and may put it under my command chair for next year when I turn 5 decades. (that is if I make it) I think I will.