Among my dart friends we have a special feat we call the "Doubles Trick." It is like a Hat Trick but instead of all three darts in the bull, you need to hit all three of your marks during doubles practice (I guess it doesn't have to be practice, but if you aim all your darts at the double ring during a live game you are just goofing around...) Slop doesn't count of course. As you can see in this pic, I was doing doubles practice, clockwise, and hit my first three marks. Cheers.
As always, click the image for a larger picture.