Yes - an unfunny comment would have been "Arachnophobia: It is inappropriate to include a huge picture of a tarantula on a page about fear of spiders." The phr

Yes - an unfunny comment would have been "Arachnophobia: It is inappropriate to include a huge picture of a tarantula on a page about fear of spiders." The phrasing, minor as the changes are, is what makes it humorous.