I was intrigued by Paul Davidson's identification of Danny Teeson as the dancer who played Mr. Six, the elderly gent in the Six Flags commercial, and I decided to do a bit of Internet sleuthing on my own. The top picture above is a cut from the website of Professional Vision Care Associates, which is a firm here in California that specializes in unusual contact lens sets and other eye-related special effects for movies. On their site, they have a Client List and as you can see, it says that they did some work for Mr. Six in a Six Flags commercial. Okay.
The second picture above is from the Google cache of that page, meaning that it's what Google saw on the site a few days ago. As you can see, in the exact same place, the client is identified as Danny Teeson. (The colors on the various words indicate that those were the search words I used to find the page.) Here's a link to the cache page, though it will probably be gone very shortly.
There are a couple of possibilities here, one being that some expertly-crafted hoax is at work here…though I can't imagine why. But it sure looks like Mr. Six was played by Mr. Teeson and also that someone had the Professional Vision Care people change their website in the last few days to remove his name. And that's all the detective work I have time for now. Good night.