What is this thing called love? This funny thing called love? Just who can solve its mystery? Why should it make a fool of me? I saw you there one wonderful day. You took my heart, threw it away. that's why I ask the Lord in Heaven above; What is this thing called love? I saw you there one wonderful day. You took my heart, threw it away. that's why I ask the Lord in Heaven above; What is this thing called love?