We have not been able to locate the source of this story.

A company was having its annual picnic at a local park. There were games, lots of food, and swimming at the beach. The weather was hot and sunny. It seemed that all of the ingredients were there for a wonderful day.

Alas, it was not to be. A large number of people got sick. They seemed fine for a while, but soon they began to get dizzy and stagger when they walked, and then they would fall down and complain of terrible cramps. At first, it was thought to be something in the water, because there were rumors about a local industrial firm dumping chemicals into the water. However, one of the bystanders suggested that it was probably the food, because swimmers who weren’t with the picnic group were OK, and besides, he added, “They also swerve who only tanned and ate.”