You're trying to read an important email when your colleague starts bouncing their leg so violently that the entire desk vibrates—suddenly you're not sure if you're having a stroke or if Kevin just discovered espresso. You attempt to move your monitor to stable ground, then your water bottle, then yourself, but Kevin's left femur is now a jackhammer with a mortgage and a Netflix subscription. By the time you give up and stare at him, he looks up confused: "What? I'm not even thinking about anything."