Speaking in practical terms, would it even be possible to make a swing with your foot on the tee marker without moving it? Most tee markers I've seen aren't heavy and bolted down like a bench or a chair would be.
I've played with guys who shot 67 or 68.
I don't know what he shot, but I was playing in the group ahead of Ed Dougherty one day many years ago. He was knocking the flags down all day long. I can't remember how many he stacked inside 10 feet, but it was more than a handful. I remember someone commenting how poor(sarcasticly) one of his shots were that stopped 20 feet from the hole. Most impressive ball striking I've ever seen in person.