This poster was created in response to beginning actors making the very weak choice of calling their character "crazy" one too many times in my career...
"My Character is Crazy!"
Think about this:
You can't just call a character "crazy" so that you don't have to justify your actions.
That's not how we work, not just as actors but as people...
It's also insensitive to those who might be facing challenges of their own, or a family member or a friend.
Find the truth of your character's motivation.