Heart surgery

A girl says, "I'm having heart surgery today." The boy says, "I know." The girl says, "I love you!" The boy says, "I love you more, much much more!" After the surgery, when the girl woke up, only her father was next to her bed. The girl says, "Where is he?" The father responded, "You don't know who gave you the heart?" The girl says, "What???" and starts crying. The father says, "I'm just kidding, he went to the bathroom."