Engriberts is the fan spelling for Angry Birds, the Rovio mobile game series first released in 2009 that became a global phenomenon. Its main theme, composed in a playful orchestral style, became inseparable from the birds versus pigs rivalry. Short clips of the music spread on soundboards and video edits in the 2010s, and the ten second loop remains in use because almost every viewer recognizes it immediately, even without seeing the game on screen.