Christopher and Philip Booth

Christopher Saint Booth and Philip Adrian Booth (born 19 February 1960) (also known as Who’s Who?) 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. It was the subject of a search between 2021 and 2024 to identify the song title and original artist. 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 with the band, but they broke up before releasing any music. They also performed as a duo under the name Who's Who?. After moving to Los Angeles in the 1980s, the brothers were low on money and started working odd jobs such as opening for Mötley Crüe, and took jobs as production assistants and set builders. They licensed some of their songs, such as "Chemistry", which appeared in the made for TV film Double Agent released in 1987. To make ends meet, some of their songs even appeared in films made by pornographic film producers. Their experience during the miscellaneous jobs they took inspired them to later make their own horror movies and paranormal documentaries in the 2000s, done through their production company Spooked Productions. Christopher also wrote books, starting with Paranoia (2015), a memoir on his experiences with the paranormal, for which he also made an audiobook version.

One of their songs licensed to the pornography producers was later used in the 1986 pornographic film Angels of Passion. It 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".