According to my research George was a designer of Pirates of the Caribbean who unfortunately died in the attraction and has haunted it since. Every morning the first cast member to enter has to say, "Good morning George" and the last cast member out at night has to say, "Goodnight George," or something goes wrong on the ride. Whether it's superstition that they do this or it's really a haunting, who knows. It's a cool story though. There are many versions of it. The most popular version I read was about George being jilted by his lover, who was playing Prince Charming in a Magic Kingdom show. His jilted lover, whose name was Troy, apparently fell for Cinderella and they decided to run off together. George found out about it and went to hide in Pirates of the Caribbean but Troy and "Cinderella" decided to ride it before they ran off. Mind you, this was before it was open to the general public. George was apparently drunk and carrying a gun. He was sitting in a hollow that's just over the drop and he carved into the ride itself something to the effect of "George + Troy forever" and he heard the ride start. When he saw who was riding, he shot Troy and "Cinderella" and jumped to his death.
It's far fetched. Most reports go with him falling to his death. Either way, he's a ghost who's responsible whenever Pirates breaks down.