People are perfectly free to write about anything they wish ( look at this rag for instance) but what really inspires folks to tap or scrawl out this or that? For me, it's indigestion. Britney? I dunno:

"In some ways, people are a lot like animals. We all hunger for the same things. Love, lust, danger, warmth and adventure. Like people, animals all have their own rhythm to life. I'm mesmerized by tigers. Their eyes, their stripes, their constant quest for survival. They almost have a sense of mysteriousness about them. They pull you in and make it difficult to look away. They make you wonder what is behind their gaze. A sense of eerie awe comes over you in their presence. The fear they give you when you pass them is stunning. Behold the beauty of the tiger."