Unplug the telephones. Advertisements
Where possible, change light bulb colours.
Pour tuna water on a carpeted area near a heating vent.
Have multiple food deliveries scheduled for staff events.
Hang undergarments under staff members’ coats.
Pour a bottle of perfume or cologne of the opposite sex in the corner.
Add pepper to the coffee supply.
Add salt to the sugar.
Hide and/or steal the tissues.