The Kazotsky Kick was added to Team Fortress 2 by Valve as a group taunt in the Smissmas 2015 update, inspired by traditional East Slavic squat dancing often linked to Kozachok and Hopak. Any class can join in once one player starts it, which made it a staple of lobbies, spawn rooms and community servers. Clips of entire teams dancing instead of fighting spread widely in TF2 videos, and the music became shorthand online for a sudden, coordinated dance break.