It looks like the phrase is quite specific and doesn’t immediately match a known book, film, art project, or public campaign. It could be a reference to a niche creative project, a roleplay scenario, a story concept, or even an internal code for a piece of content.
: In the case of USA v. Thaddeus Vaskas , the court noted a file bearing the name "PTHC Tara 8yr - Tara gets molested by a clown.wmv" as a primary piece of evidence used to support charges under 18 U.S.C. § 2252(a)(4)(B) . tara 8yo and clown 175 work
After the final showing, a child in the audience asked his mother: “Is Clown 175 real?” She hesitated. The actor (still in jumpsuit, eating his half of the granola bar) overheard and said: “I’m real when someone plays with me.” It looks like the phrase is quite specific