- Siren Head was indirectly referenced by none other than the SCP Foundation, which features SCP-5987, "Sirenhead"... which is an anomalous sculpture in the shape of a siren used as the figurehead of a ship. The structure of the article — obfuscating the physical description of the entity under notes and page links — is very much meant to be a Bait-and-Switch for those expecting it to be Trevor Henderson's creation, with its image and respective description coming only at the very end as a punchline. Even the SCP designation, 5987, references the fact many internet-goers falsely dub Trevor's Siren Head "SCP-6789" (to be crystal-clear, the actual current SCP-6789 is completely unrelated to him and his work — Trevor's only direct contribution to the SCP Foundation is Big Charlie, who was inducted after his creation as SCP-4158).
- Freshy Kanal's RAP BATTLE series: Trevor Henderson rap battled against Corpse Husband in season 4, with Long Horse and Siren Head as assist characters. The real Trevor Henderson disapproved of this and forbade Freshy from using him or his characters in future battles.
