#ThePlanesHaveStopped
From Tardis Wiki, the free Doctor Who reference
"#ThePlanesHaveStopped" was a hashtag used by the students of Coal Hill School online on news sites and Twitter on orders by their teacher Clara Oswald when planes all around the world seemed to have frozen in mid-air, in fact a time stop created by Missy to catch UNIT and Clara's attention when the Twelfth Doctor went missing. (TV: The Magician's Apprentice)
