Characters
A boy's best friend is his mother.
— Norman Bates · Psycho
Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker asserts that a boy's closest friend is his mother. Taken at face value, it honours maternal devotion and companionship. The blunt phrasing could also sound possessive or overly dependent, so the line can read as either sweet loyalty or an uneasy claim about attachment.
Context reviewed