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- What kind of pine has the sharpest needles?
A: A porcupine
- What is drawn by everyone without pen or pencil?
A: Breath
- What is that which full of holes and yet holds water?
A: A sponge
- What did the fog bank say after somebody tried to hit it?
A: You mist me

Q: What walks on four legs in the morning?
A: He walks in four legs in the morning, like a baby he crawls. Two legs in the afternoon, like an adult. Three legs in the evening, as an old man with a cane.

Found it on Percy Jackson