You can rent a guitar without worrying about who rented it before you. You can play the guitar with your bare fingers and no protective covering. You can get rich playing a guitar, not broke. A guitar doesn't take half of everything you own when you sell it. A guitar doesn't care how many guitars you own.
Women are more fun when the power goes out.
You can't get your guitar wet. A guitar won't beg to be played. It's no fun to tie your guitar to a bed and spray whipped cream on it. When playing a guitar, you can use your teeth, but not your tongue. A guitar won't play you back.