The author states "Virality is rare and nearly impossible to predict" and yet one of his products aims to automate the creation of "viral LinkedIn posts"! Much irony.
Hmmm let's see — restrooms, people sitting outside (like the kids in the photo) or passing close to each other, even cars parked closer than 2m together with the window open. I'm sure there are more. (Edit: I'm not saying that any of these are highly likely, but I do think it's impossible to rule them out).