Not always. Sometimes it is in the most unusual places. On the Hollywood hills for example 
And sometimes it is better than the writing on the page! Here are some examples:
Think like a genius, work like giant, live like a saint.
The chamber of secrets has been opened- enemies of the heir, beware.
One day this wall will be replaced by trees. Stephanie.
Remember, no matter how cute he is, somewehere, some girl is tired of taking his shit.
Never trust a skinny cook
And my favourite – Stop me before I paint again!
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My Writing Life 