I've lost my memory of an old kung fu movie that I think is a Jackie Chan. The one thing I can remember that will distinguish it from all the others is the opening scene... The main character is hopping along rooftops and fences in an amazing casual sky-high balancing act like prancing through a dewy meadow. During this act are the opening credits to a simple theme song which is either just someone whistling or humming a tune. Can anyone help me remember what this movie us???