Employees value a fun workplace, and it's an inexpensive job perk to provide. But can you justify spending company time and money on Nerf tournaments and egg races? Yes, says Nancy Kramer, CEO of Resource Interactive, a digital-marketing firm in Ohio. "A fun environment helps people tap into their inner child and tap their creativity," she says. Don't do it too often, she says, or you'll build a sense of entitlement.