Having no luck training his pet, a dog owner asked an evangelist to help.
A week later, the evangelist returned the dog and demonstrated his success by throwing a stick and ordering "Fetch". The dog returned with the stick and, on the command "Drop", placed it at his feet.
Nest, the evangelist said "Roll over", which the dog immediately did. Excitedly, the owner told the dog "Heel".
The animal placed its paw on him and said solemnly "I command this sickness to leave you".