well of course having fun is silly, no one said silliness is just for kids. Willy Wonka said it best: A little nonsense now and then is relished by the wisest of men.
I have a few pranks I play on the truck drivers at work. Imagine being a truck driver and after spending two hours chaining a combine to a trailer, the guard (me) checks the serial number and tell you that you have the wrong combine when you get ready to leave. Sometimes the looks I get are priceless. I of course let them off the hook before they get too pissed, and they are all good sports about it. Or I tell them that the chains they use have to be green because that is a new rule just started by JD. (nobody really cares what color the chains are).
The majority of the truck drivers that come into the plant enjoy my playful attitude, and I always kid around with them, because there is nothing more stressful than being a truck driver and having to deal with all the idiots out on the roads. A little joke goes a long way to relieving the stress. Some drivers you can’t kid around with, so I save my best bits for the guys and gals that actually have a sense of humor. Sometimes they prank me back, which of course is only fair.