We used to post this on the wall at one of my previous jobs:
"Positive prior planning prevents [censored] poor performance" next to: "Lack of planning on your part does not constitute an automatic emergency on my part!".
Comments from clients made the boss take the second one down from the wall. <img src="images/graemlins/mad.gif" alt="" />
Plus, we charged a lot more for clients that didn't plan, and needed something emergently! <img src="images/graemlins/grin.gif" alt="" />