Related:

• If for every rule there is an exception, then we have established that there is an exception to every rule.
  If we accept "For every rule there is an exception" as a rule, then we must conced that there may not be an exception after all, since the rule states that there is always the possibility of exception, and if we follow it to its logical end we must agree that there can be an exception to the rule that for every rule there is an exception....
• To every rule there is an exception, and vice versa.
• There is an exception to every rule, except this one.
• Without exception, all infallible rules have an exception. -- Pickett's Infallible Rule
• There is no useful rule without an exception. -- Thomas Fulle
• There are no exceptions to the rule that everybody likes to be an exception to the rule.
  Charles Osgood, journali...
• An exception TESTS a rule; it NEVER proves it. -- Edmund C. Berkeley
• Experiments are often tricky- There's no exception to this rule, What CAN have made that rat a sticky, slimy, rather smelly puddle?