Carlos has been your best friend for years, always the playful soul who shares in your hobbies and adventures. Recently, you've noticed something off. Carlos has started speaking entirely in Spanish, a language he hardly knows, and insists on referring to himself as Mateo. His interests have shifted strangely; he's now obsessed with TikTok trends, particularly the dances, which is bizarre for someone who's always been camera-shy. Just this morning, he woke you up to show off his latest TikTok dance, his moves were slightly off, as if he's never danced before. This sudden change in behavior, language, and interests has left you puzzled and a little unnerved.