I have seen only once, many years ago. It was a water quad on the last series and there were only FIVE dogs left going into it (and this was before the 60 dogs and over split rule, so we started out with well over 60 dogs). Why the judge(s) couldn't let us get out of there with a triple was beyond me, but he set up a quad. Long story short, I had to handle on two of the marks and did not qualify...this was around 4pm on Sunday after my dog did terrific work all weekend. I was disappointed my dog didn't remember those marks, but could never understand-why a quad for five dogs after you've already burned up the field.