A man takes his dog to the vet claiming the dog is listless and sick.
The vet examines the dog and says 'Your animal's fine, just a bit
tired, feed him vitamins.' The man insists that can't be it, and
presses the vet for a better workup. The vet takes a cat, puts it in
front of the dog; no reaction; puts it in back of the dog; no reaction.
The vet says again 'your dog needs this vitamin program to restore
his vitality.' The man gets the bill, and it's $500. He complains
'What's this for?' The vet says '$50 for the office visit, $20 for the
vitamins, and $430 for the catscan.'