It is wise to remember that you are one of those who can be fooled some of the time.
If at first you don't succeed, you may be at your level of incompetence already.
If two wrongs don't make a right, try three.
Originality is the fine art of remembering what you hear but forgetting where you heard it.
The incompetent with nothing to do can still make a mess of it.
The unexpected always happens.