There's probably lots. Two that immediately come to mind are "Failure is not an option!" and "No child left behind".
Both are inspirational, of course, but neither is realistic. Failure is always an option....and it's not always bad. We learn from our failures a lot more than we learn from our successes, and every new idea or experiment always involves the possibility of failure. Edison is said to have failed to make a successful incandescent light for hundreds of times. He supposedly said he wasn't discouraged because he knew hundreds of ways it couldn't be done and by a process of elimination he was sure to find a way it could.
"No child left behind" is also absurd. Oh, it's a beautiful concept, but unfortunately some children must be left behind. Tragically, some kids are not blessed with a brilliant mind and if you teach to the lowest denominator, a lot of kids will graduate being ignorant of much of the knowledge and skills they need to pursue higher education. In my teaching career, I watched the standards of subjects being gradually lowered to the point that many students had to take remedial math and English for no credit when they entered their freshman year of college. You'd think their parents would be furious because they were indirectly paying for the incompetence of their high school's performance. In fact most were proud that their kids were in college and bragged about it.