Backwards piano is kind of icky.
And George Lucas on why he is against changing films before he started changing all of his films:
“These current defacements are just the beginning. Today, engineers with their computers can add color to black-and-white movies, change the soundtrack, speed up the pace, and add or subtract material to the philosophical tastes of the copyright holder. Tomorrow, more advanced technology will be able to replace actors with ‘fresher faces,’ or alter dialogue and change the movement of the actor’s lips to match. It will soon be possible to create a new ‘original’ negative with whatever changes or alterations the copyright holder of the moment desires….
In the future it will become even easier for old negatives to become lost and be ‘replaced’ by new altered negatives. This would be a great loss to our society. Our cultural history must not be allowed to be rewritten…. Attention should be paid to the interest of those who are yet unborn, who should be able to see this generation as it saw itself, and the past generation as it saw itself.”