Characters
I think it's ironic that it was dad's weight that allowed him to plug the hole, while a slimmer man would have fallen to his death.
— Lisa • The Simpsons
Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker points out an irony: their father's heft let him plug the hole, whereas a slimmer man would have fallen to his death. It is a dry observation that a trait usually treated as a flaw proved life-saving in exactly this moment.
Context reviewed