Via the C2 Wiki:
After an idea is tried and has failed, been tweaked and tried again, been tweaked and tried again, etc. my inclination to reject the idea and look for alternative solutions.
However, management (and colleagues) frequently claim that that they "know why it didn't work", proceed to address the most obvious manifestation of problems with shallow solutions and chant "ItWillWorkThisTime". (They disapprove of my "negative attitude".)
Lots more good stuff on this topic over there.