Angry Birds, the puzzle game developed by Rovio and first released in 2009, made its round green pigs instantly recognisable, with the smaller Minion Pigs serving as the game's common enemies. Their cartoon squeaks, grunts and yawns became part of the game's playful sound design, and short clips later spread on meme soundboards and in fan edits. This particular yawn is still used because it is short, clear and immediately funny, giving creators an easy way to signal tiredness or boredom without using a longer voice line.