SCP-141 - Codex Damnatio
SCP-141 has apparently been employed in... heretical trials of the Catholic Church..., the Spanish Inquisition, the witch hunts of the 17th century, and the Red Scare of the mid-20th century.
SCP-2000 - Deus Ex Machina
Since its inception, SCP-2000 has been activated at least twice.
SCP-091 - Nostalgia
“Assistant Researcher ████ — while viewing a recording of her wedding from 199█ — noted SCP-091 in the background of the film and noted a strong flood of nostalgic memories attached to it…”
SCP-055 - [unknown]
Who authorized the construction of SCP-055's containment room, why it was constructed in this way, or what the purpose of the described Containment Procedures may be, are all unknown.