My top 5:

6. I’ll try being nicer if you’ll try being smarter.
13. I have plenty of talent and vision. I just don’t give a damn.
14. I’m already visualizing the duct tape over your mouth.
20. I’m not being rude. You’re just insignificant.
31. I’m trying to imagine you with a personality.

http://www.stamey.nu/Humor/ThingsYoudLikeToSayAtWork.htm
http://www.stamey.nu/Humor/ThingsYoudLikeToSayAtWork.htm
http://www.stamey.nu/Humor/ThingsYoudLikeToSayAtWork.htm