#justiceman

Garou can offhandedly mention it and Saitama suddenly recalls Justiceman show from his childhood and they can geek out over the show. Garou would be giddy knowing someone who has actually watched the show.

Then they can get into an argument about which character is cooler, Crab Man or Justiceman. Or which ideology is the right one and then they can get into heated argument about it and spew out their own opinions about why they think each character is so cool and righteous and such.

And then at the end, both can realize that Justiceman was just trying to defend the citizens from further harm and that Crab monster was trying to protect the sea from humans, who have a tendency to pollute nature without care.

Making the realization happen that not everything is as black and white as it may seem. Then they can give recognition for each other's favourite characters in the show that they're actually kind of cool, when it's pointed out that way, that they're still trying to do what they feel is right.