[ZephyrBlu]

I would call them the exceptions that prove the rule.

[fnord123]

That's not what that means.

It means a sign saying "no blue cars" is the exception proving the rule that non-blue cars are allowed.

[auggierose]

Kind of like special relativity is an exception to Newtonian mechanics?

It's good to know the rules, but you shouldn't live your life by them.