Physical Danger
For a sedentary job, there are plenty of opportunities to seriously injure yourelf.
When you're not hammering nails, operating an oscillating spindle sander, or running with scissors (hey—sometimes there are wrapping emergencies), you're in constant danger of being Larry-Moe-and-Curlied by one of your co-workers. This includes unprompted eye-pokes, blows to the head with frying pans, and any number of other instances of impish prankery.
It can certainly get wearisome having to work with an eye in the back of your head at all times...but that's what you get for working with elves.