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

A Buddhist gentleman was in the habit of leaving a bit of food on an altar each morning before departing for work. One morning he had left a freshly fried eggroll. Before he left the house, he noticed that the tidbit had disappeared. When he questioned his houseboy about the matter, the houseboy guiltily replied, “I knaw its only wokkened roll — Buddha lack it.”