The trope of the "train bathroom" as a site for spy-craft and action is well-established in media: Citadel (2023)
, a bullet train outfitted as a mobile spy headquarters for British secret agents Finn McMissile and Holley Shiftwell. The Toilet Scene : A key comedic moment involves the character encountering an advanced Japanese toilet Media Content spy cam in train toilet wwwsickpornin avi verified