Why are fish easy to weigh?
Why this joke works
Weighing a Fish
Scales can mean weighing equipment or the small plates covering many fish. The question activates the measuring meaning, while the answer treats the fish's body covering as built-in equipment. Their own makes the substitution sound like a useful convenience. Keep the answer brisk and practical, as though solving a minor problem. A real weighing demonstration would add work without making the language turn any clearer.
A closer look
One spelling, several meanings
This riddle changes the meaning of a repeated idea rather than the spelling of its key word. Both kinds of scales are genuine vocabulary, so no funny pronunciation is needed. It can start a comparison with musical scales afterward, but adding that third sense inside the joke would distract from the simple equipment-and-animal pairing.
Fact behind the joke
Scales can help reveal age
Growth patterns on the scales of some fish can help researchers estimate age. This method is not suitable for every species, and other structures such as ear bones may be used instead. Fish scales cannot weigh their owner, but they can carry useful biological information.