Squigly Squigly's Brain Teasers

Question:

There is a man on an island prison, he cannot swim. One day he escapes using nothing but himself. There is no bridge. How does he do it?

Answer:

He escapes in the winter when the body of water surrounding the island is frozen. He simply walks away.

Try another Brain Teaser:

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?