Authors:

A healthy person goes 'Yes,' 'No,' and 'Whoopee!' An unhealthy person goes 'Yes, but,' 'No, but,' and 'No whoopee.

"They Shoot Managers, Don't They?: Managing Yourself and Leading Others in a Changing World". Book by Terry L. Paulson, p. 3, 1991.
A healthy person goes 'Yes,' 'No,' and 'Whoopee!' An unhealthy person goes 'Yes, but,' 'No, but,' and 'No whoopee.