Crazy like a fox

[Tanya Shivari]

Implys the opposite. The individual refered to is not crazy at all, rather cunning (like a fox). Used when one appears to be crazy, but is acting with a hidden motive, in a cunning way

[Tina]

an individual whose actions are unpredictable; they can be cunning (or at least like to think that they are) and a bit sneaky. Not to be confused with [batshit crazy], though ingestion of alcohol and other narcotic substances can lead to the fox in question to lose the ability to disguise their craziness and indeed become a [crazy freaking maniac]

[Donald Trump]

Simile used to describe a person or event that acts or is outside of the norm in either a sneaky or fun way. May also be used in elliptical form (parts of the phrase are implied and not actually spoken). Origin: Homer Simpson.

[Justin Bieber]

phrase to exaggerate craziness, often in sarcastic or half-joking form.