TV
I understand the concept of humor. It may not be apparent but I am often amused by human behavior.
— Seven of Nine · Star Trek: Voyager

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker distinguishes understanding humour from visibly showing amusement. Human behaviour is said to be a frequent source of entertainment, even if others cannot tell. The explanation asks the listener to look beyond outward signs when judging what the speaker perceives or enjoys.
Context reviewed