It Makes a Difference to the Sheep

How do I know? I took the following test and passed with flying colors:

In the photo there are 2 identical dolphins. Look at both dolphins
jumping out of the water. A closely monitored, scientific study of a group at St. Mary's Hospital revealed that in spite of the fact that the dolphins are identical, a person under stress would find differences in the two. If there are many differences found in the two dolphins, it means that the person is experiencing a great amount of stress. Look at the photo and if you find more than one or two differences you may need a vacation.

The photo is here.