The 'Back up Terry' clip comes from a viral video of the early Vine era, in which a man films his friend Terry sitting in a wheelchair that begins rolling backward down a hill. As Terry picks up speed, the filmer shouts 'Back up, Terry!' over and over in escalating panic. The clip exploded on Vine and YouTube, turning the phrase into a catchphrase for any situation spiralling out of control. A decade on, it survives as a reaction meme, dropped over fail compilations and runaway-object videos for its raw, helpless comedy.