A Velociraptor used to love eating peanuts and so during his puberty, he developed acne. His friend, realising his angst,told him acne can only be cured by wearing a horseshoe while drinking a cocktail made of cat pee and singing an acapella to a full moon. The Velociraptor did it but ended up falling down the stairs and hit his head thirteen
times. All this happened on his thirteenth birthday. And that's why he has Triskaidekaphobia. What a bad luck.