Crazy Train was released in 1980 as Ozzy Osbourne's debut solo single after leaving Black Sabbath, opening his album Blizzard of Ozz. The song begins with the shouted invitation 'All aboard,' a playful nod to a train departing, before launching into Randy Rhoads' instantly recognisable guitar riff. Over the following decades it became a staple of rock radio, sports arenas and film soundtracks, and the opening shout took on a second life online as a short, punchy cue for entrances, departures and hype moments. Its energy and instant recognition keep it in regular use in memes and edits.