The greeting comes from Bugs Bunny, the wisecracking rabbit at the centre of Warner Bros. Looney Tunes cartoons, where the line became his trademark way of addressing Elmer Fudd and other rivals while staying cool under pressure. Voiced in the classic shorts by Mel Blanc, it travelled far beyond television through reruns, compilation videos and later internet memes, where the calm delivery made it an easy shorthand for confidence and mischief. It endures because even listeners who have never seen a full cartoon recognise the voice, the rabbit and the joke in just a few seconds.