What's a tweet that's so canonical in your mind you make shorthand reference to it, even if people might not know what you're talking about? (I sometimes just say "uh oh y'all it's gettin' kinda hazy" expecting people to get it)
It's not a tweet, but in the category of "foreign child says something hilarious", my wife and I quote this Tina Fey anecdote where a Greek kid panicking because his mom was gonna be late said what translates into "oh my Maria, what is to become of us?"