A woman brings a duck to the vet. The vet says "your duck is dead". The woman says "are you sure?"
Vet: "Yes". Woman: "How can you be sure you've done no tests?".
The vet brings in a Labrador retriever which sniffs the duck and shakes its head. Next, a cat sniffs the duck and shakes its head. Vet says "sorry, but as I said your duck is dead".
Vet hands woman a bill. She cries, "$820 to tell me my duck is dead!". Vet says "if you had taken my word for it, the bill would be $20, but Lab Reports and Cat Scans cost extra". #comedy source