Used to ride around in lifts pretending to be doing something very important. Had a really eager boss who wanted us to work flat out all the time. It was fun, got to press some buttons, open and close doors (they were industrial lifts, all manual). We also had a big open freezer-like machine which kept ice cubes cold so after the restaurant had closed down, we'd stick our hands in there and see who would last longer. Then there was trolley racing, closing people in fridges, putting shoes through industrial dishwashers and walking back home in them. Was fun, without that tiny bit of entertainment I'd have quit. Depends where you're working, but if it's catering then here are some ideas.