Existence

Riddle: A forest exists somewhere on Earth. This forest has no life except for trees. After a storm, a tree was hit by lightning and falls. What sound would it make?

Answer: None. Sound does not exist if it is unheard.

Source: https://www.riddles.com/index.php/1263

A forest exists somewhere on Earth. This forest has no life except for trees. After a storm, a tree was hit by lightning and falls.
What sound would it make? — Existence by Anonymous v1.

Riddle: A forest exists somewhere on Earth. This forest has no life except for trees. After a storm, a tree was hit by lightning and falls.
What sound would it make? Answer: None. Sound does not exist if it is unheard. — by Anonymous v2.