The Speaker Swap

Since you’re already under the desk, try out another switcheroo: the speaker swap. Just plug their speakers into your computer. Now start playing something like a low-frequency heartbeat sound on loop and see how long they try to stop the nuisance on their computer. For a more powerful variation, don’t switch the actual wires, but instead just swap out one of your speakers — preferably the one without the volume control — with theirs. Now they’ll still hear their own system sounds from the remaining speaker, and as an added bonus, they’ll have no way to control the volume of your annoying antics.