Everybody Knows Dave

The 'Everybody Knows Dave' meme first appeared in r/jokes in 2016. It is used in a sarcastic fashion typically saying that one knows Dave and referring to something personal sounding that only someone who knew this hypothetical Dave would know. This meme seems to stem from an old joke about a man named Dave and his boss. Dave claims to know everyone in the world, so his boss twice tells him to prove it. The third time, Dave is recognized, with the Pope's identity unknown, and the boss has a heart attack in disbelief.