Christopher Saint Booth and Philip Adrian Booth (born 19 February 1960) are British-Canadian twin brother musicians and filmmakers best known for the 1986 song "Ulterior Motives". The song became known in the lostwave community, a social media subculture based around obscure songs, as "Everyone Knows That" (EKT); its authorship and title were not known to the online community. The community originally only had a 17-second clip of the song, which was originally posted by user carl92 on the French song identification website WatZatSong. The song was the subject of a search between 2021 and 2024 to identify the song title and original artist, and was then found in the 1986 pornographic film Angels of Passion. As filmmakers, the brothers have made several documentaries on ghosts, haunted locations, and exorcisms. Together they directed several horror movies in the 2000s, with some notable actors, such as Matthew McGrory.
Originally from Halifax, UK, they moved to Canada in the 1970s. Christopher Booth replaced Bryan Adams as a vocalist of the band Sweeney Todd, in which his older brother John was the drummer and his twin Philip played guitar. They performed several live shows, but left the band before releasing any music.
After moving to Los Angeles in the 1980s, the brothers formed the band Who's Who?. Unable to secure a record deal, however, they began to license their original songs for inclusion in pornographic films, through their connection with a friend who worked as a crew member in the adult film industry. One such song that appeared in Angels of Passion later became a popular example of lostwave after a short snippet of the song was uploaded to WatZatSong by a user named Carl92 in 2021 and the search for it became an Internet phenomenon. In April 2024, the song was identified as "Ulterior Motives".
While licensing songs to pornographic films, the brothers also took miscellaneous crew jobs such as production assistants for some of those same projects. Their experiences during these jobs later inspired them to make their own horror films and paranormal documentaries, produced through their production company Spooked Productions.
Christopher's first book, titled Paranoia, was released in 2015. It is a memoir of his experiences with the paranormal, for which he also made an audiobook version.