Most of the NDAs I've been party to are too serious to mess with.  Realistically I've noticed that in real life when people mention NDAs, it is just a way of backing up what they are saying without proof... People who sign real (serious) NDAs hardly ever mention it, because there is no point and it only opens you up for criticism and could lead to misunderstandings or law suits if someone else ever disclosed information which you are making reference to... Bad Mojo man.