'Trick or treat' is the traditional phrase children chant at doorsteps every Halloween, and short voice clips of it circulate widely across meme pages and soundboards each October. The two-second format suits fast reaction edits, where the line works as a seasonal greeting, a joke setup or a transition cue. Because the wording is universally recognised, creators reuse it year after year without it feeling dated. Its popularity peaks in autumn but it still appears in costume compilations and spooky-season streams well beyond the holiday.