While I was at work one day, my five-year old was playing in the office with a set of children's plastic keys. She stuck the keys in my face and said, "Really you don't need any of these keys."
Me: "You don't?"
Her: "No, you just need the love key."
Me: "What's the love key?"
Her: "It's your love."
Me: "What's it good for -- What can I open with it?"
Her: "It opens the great, big door in front of everything."