The coolest golf tee ever was introduced to me at Kingsbarns Golf Club in Scotland. The large cup and curved slot allow you to actually put the tee and your ball in the ground at an angle.

The theory is that this design allows a set up that causes the least possible resistance from the tee when your club impacts the ball.

I love it, but it drives my golf buddies crazy.

One in particular who spends a lot of time making sure his tee is perfectly straight up (you know who you are)!!