John accidentally saying ‘beautiful’ instead of ‘brilliant’ when Sherlock is making deductions and Sherlock doing the blinking thing he did when John asked him to be the best man and Lastrade just smiling really smugly as he watched
OH. MY. GOD.
i bet sherlock has to stop deleting “extraneous” non-urban animal breeds because of that time he called a deer a weird dog and john fell to the ground wheezing