LawOfExceptions
From WikiWorld
The exception proves the rule.
There is an exception to every rule, except this rule.
On its face, the law of exceptions is absurd according to ClassicalLogic. Yet it is indeed quite true in that even it has an exception. In Truth the statement involves self-reference and is undecidable by Godel. It is a good example of undecidability and perhaps a basic principle of the nature of Truth.
