Wonder where the nickname 'Zipper Head' comes from?

Here is Terri and Joleen showing off their new 'zippers'. Though it might sound mean, people that have had decompression surgery to correct Chiari Malformation do refer to themselves as 'Zipper Heads'. So if you say, 'Hey you, zipper head', don't be surprised if they say, 'why thank you, you are looking at the most expensive zipper you can buy!'.