Your last good table tennis ball fell into a narrow metal pipe imbedded in concrete 30cms deep.
How can you get it out undamaged, if all the tools you have are your table tennis bat, your shoe-laces, and your plastic water bottle, which does not fit into the pipe?
A man is hauled into a police station to identify a man in trouble. The man turns to the officer and says "brothers and sisters have I none, this man's father is my father's son." Who is the man in trouble?