1.We’ve never done it before.
2.Nobody else has ever done it.
3.It has never been tried before.
4.We tried it before.
5.Another company/person tried it before.
6.We’ve been doing it this way for 25 years.
7.It won’t work in a small company.
8.It won’t work in a large company.
9.It won’t work in our company.
10.Why change–it’s working OK.
11.The boss will never buy it.
12.It needs further investigation.
13.Our competitors are not doing it.
14.It’s too much trouble to change.
15.Our company is different.
16.The ad department says it can’t be done.
17.Sales department says it can’t be done.
18.The service department won’t like it.
19.The janitor says it can’t be done.
20.It can’t be done.

via: http://www.surfarama.com