Ellis is one of the four survivors in Valve's Left 4 Dead 2, released in 2009, and adrenaline is an in-game item that temporarily increases a survivor's speed and health recovery. Short lines from the game have long circulated as soundboard clips among fans, because Ellis's cheerful Southern personality makes even small reactions memorable. The adrenaline clip is shared in gaming edits, streams and meme videos as a shorthand for getting a sudden second wind, and it remains popular because it is short, clear and instantly tied to that frantic co-operative survival gameplay.