A little sarcasm can go a long way - research on humor in the workplace:
Bottom Line: It's probably not a surprise that appropriate humor is generally a positive at work. Researchers from the VU University Amsterdam identified that workplaces that include regular humor are generally happier and more productive environments. Among the findings:
Humor indicates confidence
Picking up on the creativity topic...Here's something that you might be surprised by. The form of humor most effectual for enhanced creativity is sarcasm. Who knew? As with anything balance and appropriateness is key for all forms of workplace humor but generally it's clear that a good laugh can go a long way while working.