there is an exception to every rule
Usually said in a situation when the rule is incorrect and unusable.
exception
UK /əkˈsɛpʃən/ US /əkˈsɛpʃən/
noun 5
Definitions
noun
1
The act of excepting or excluding; exclusion; restriction by taking out something which would otherwise be included, as in a class, statement, rule.
the exception of a rule
2
That which is excluded from others; a person, thing, or case, specified as distinct, or not included.
That rule is usually true, but there are a few exceptions.
The Thirteenth Amendment to the U.S. Constitution had abolished slavery but allowed one major exception: slavery remained appropriate as punishment for a crime.
3
An objection, on legal grounds; also, as in conveyancing, a clause by which the grantor excepts or reserves something before the right is transferred.
4
An objection; cavil; dissent; disapprobation; offense; cause of offense.
5
An interruption in normal processing, typically caused by an error condition, that can be raised ("thrown") by one part of the program and handled ("caught") by another part.
null pointer exception
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