In North America, trick or treating is a Halloween custom, in which children go door-to-door to say "trick or treat" as a way of asking for treats. I'm wondering if there are any common or at least understandable replacements for it.
Additionally, after searching trick or treat on EL&U, I'd like to expand my original question and include a request for its origin. Its phrasing presents "trick" as an alternative to "treat"; but, giving out tricks doesn't seem to be prevalent. Hopefully "trick" wasn't added without reason; so, I'm also looking for the origin of the Halloween phrase, trick or treat.