What is the best way to set up Program - WAV Launcher on someone's...

Wait until the victim steps away, then run Program - WAV Launcher from a USB drive with your chosen settings. For maximum confusion, pick something mundane like Notepad or Calculator -- programs that are not alarming but have no reason to open on their own. Set the interval to 3-5 minutes so the effect is frequent enough to notice but not so rapid that it is obviously a prank.