CJ: Your superstition about using a tee that had been used on #18 is interesting, and relates to the story I was going to tell.
I read this years ago but have no idea whether it's true or not:
When Doug Sanders was contending to win the Open Championship in 1970, he came to the last hole at St. Andrews needing a four to win. On the tee, his caddie hands him a white tee and says "This is the same tee the late Tony Lema used when he won the Open here in '64." But, it was a white tee, and Sanders had a superstition about using white tees. He uses it, three-putts for bogey, and loses in the playoff the next day.
After hearing that story I have always tended to avoid using white tees. The pro at Crystal Downs started handing out flourescent orange tees years ago because people are more likely to pick them up (and the mowers won't be damaged by used tees) ... I like to play with those, but I sometimes run out of them in winter.