Back when PCAnywhere was young and RDP wasn't even an itch in Bill's pants....
I once shared an office with a young chippy and the staff's resident crumudgeon. A likeable fellow, but a bit reactionary too.
I loaded the new & shiny PCAnywhere on his computer and set up a host session. Set it to auto-launch at boot too (Win98 days where everything needed a mid-day restart). Sitting across the office I would jiggle his mouse off the 'Okay' button when he targeted it. I would add extra characters when he was typing too.
Hilarity ensued, as he operated the PC slower & slower, trying to catch his mistakes when they happened. Hand waving and eloquent cursing whenever the unexpected happened. Myself and the young chippy were duly entertained for days until finally fessing up to the prank.
This was, of course, back in the days when people had a sense of humor. Today, such a prank would be a major InfoSec & HR violation.