Woman brings a duck to Vet. Vet says, Your duck is dead. Woman says, Are you sure? "Yes". How can you be sure you've done no tests. Vet brings in a Labrador retriever which sniffs the duck and shakes his head. Next, a cat sniffs the bird 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