Three fruit boxes
Picture three boxes containing fruit.
The first box is marked peaches, the second is marked oranges, and the third box is marked peaches and oranges.
Each of the boxes is labeled incorrectly. How could you label each box correctly if you were allowed to select only one fruit from one of the boxes.
See result
First you select a fruit from the box marked peaches and oranges. If it was a orange you selected, you know that the box could only contain oranges. If it was a peach, you know that the box could only contain peaches since each box is incorrectly marked. If, for example an orange was selected, you would mark that box oranges and take the one marked peaches and move to the other box. Then you mark the last one peaches and oranges.
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