>purchase superglue and airhorns >glue airhorns to the bottoms of chairs >wait for someone to sit down. Note, if you do not have swivel chairs where you work do this instead >apply superglue a chair, bench, or any seating >hide >wait for someone to unthinkingly sit down and get glued to the chair >wait until you are sure they are stuck to the chair >sneak up behind them >use airhorn