I had a CTO tell me to fill a cubicle with quick drying cement after a prank went wrong but I stalled him long enough to cool down. I knew the building management company would have been furious had I followed orders. The CSO had pranked the CTO with a dongle that opens excel and slowly types "I know what you were doing..."
next time recommend using expanding insulation foam instead, but first cover everything with big sheets of plastic. the victim will still have a hell of a time getting rid of the foam. that stuff hardens...