Twenty Ways to Say No

1. I Am In The Middle Of Several Projects
2. I Am Not Comfortable With That
3. I Am Not Taking On Any New Responsibilities
4. I Am Not The Most Qualified Person For The Job
5. I Do Not Enjoy That Kind Of Work
6. I Do Not Have Any More Room In My Calendar
7. I Hate To Split My Attention Among Projects
8. I Have Another Commitment
9. I Have No Experience With That
10. I Know You Will Do A Wonderful Job Yourself
11. I Need To Focus More On My Personal Life
12. I Need To Focus On My Career Right Now
13. I Need To Leave Some Free Time For Myself
14. I Would Rather Decline Than Do A Mediocre Job
15. I Would Rather Help Out With Another Task
16. Let Me Hook You Up With Someone Who Can Do It
17. No
18. Not Right Now, But I Can Do It Later
19. Some Things Have Come Up That Need My Attention
20. This Really Is Not My Strong Suit

Rationalizations from Ramona Creel here