who shot John

anybody who is anybody

Any person who is well-known or important, especially one who has prominent social standing.

big shot

A person with a reputation of importance or power.

chip shot

Something that is easy to do or to achieve.

dog who caught the tire

One who accomplishes a seemingly impossible feat, but does not know what to do next.

everybody who is anybody

All of the people who are well-known or important, especially those who have prominent social standing.

give it one's best shot

To make one's best effort or attempt; to try as hard as possible.

honest John

An ordinary, honest, member of the public

John Hancock

A person's signature.