The 'Typing . Into YouTube' (also known as 'Full Stop Punctuation') meme refers to a viral internet mystery and creepypasta involving the YouTube search algorithm. Users discovered that entering a single period or other specific punctuation marks into the search bar would trigger auto-suggestions leading to disturbing, cryptic, or graphic videos. This phenomenon became a massive trend on TikTok and YouTube as creators documented their 'rabbit hole' journeys into the platform's darker side. Memes surrounding this topic typically contrast a curious user with the unsettling content they encounter, often utilizing horror aesthetics or reaction templates to highlight the bizarre and scary nature of these algorithmic glitches.