ok so for whatever reason theres a parrot in 221B and Sherlock gets drunk or high and starts talking to the parrot about his problem and how he loves john but how he knows its hopeless and he'll be content to just be friends but the parrot memorises certain incriminating parts of the speech and repeats them (either to sherlock and he tries to get rid of the bird or to john who confronts sherlock)

(no i haven't been watching hey arnold idk what you're talking about)