The answer to the riddle "What man cannot live inside a house?" is a "man" who is a fish, specifically a "man" that is actually a fish like a "man-eating fish" or more simply, the answer is often "a fish" because fish cannot live inside a house-they need water. Another common interpretation is:
- A "dead man" cannot live inside a house.
Or sometimes the riddle plays on words:
- A "fireman" cannot live inside a house because his job is to go out and fight fires.
If you want a classic, simple answer:
- A "manhole" (a manhole cover) cannot live inside a house.
If you want a more poetic or lateral thinking answer, let me know!