At some point, you may want to write a murder mystery, or just insert a murder into your story. You may need to have a character behave in a way that’s inexplicable, or less than normal. You may need to write a character who’s crazy. But what do you know about insanity?
Crazy is as Crazy Does
To simply write a character who is “crazy” is going to feel unsatisfying. Being crazy is a motive for killing someone or running around the street naked and screaming, or doing other things that just plain don’t make sense. But it’s not an explanation, and your readers are going to crave an explanation. How is this character crazy? Why are they insane? Because what you have to remember is this: the character doesn’t know they are insane. To them, everything they are doing makes perfect sense. So before you write it, you have to get inside of their crazy.
Are you ready to make yourself insane? Because if you’re going to write crazy, you need to know it.