One man shows another the portrait of a gentleman and tells him: I have neither brothers nor sisters, but this man's father is the son of my father. Who is the man in the painting?
The gentleman in the portrait is the son of the man who is speaking.
A man was outside taking a walk, when it started to rain. The man didn't have an umbrella and he wasn't wearing a hat. His clothes got soaked, yet not a single hair on his head got wet. How could this happen?