CONFIRMED: $5 Regal Monday Mystery Movie AND $5 AMC Screen Unseen for Apr 15, 2024
The two Reddit threads dedicated to guessing the mystery movies each have posts that theater employees confirmed that this Japanese anime is the mystery movie. An AMC employee said that they were told to play the Japanese version with English subtitles, even though they also have a dubbed in English version.
https://www.reddit.com/r/RegalUnlimited/comments/1bzywx4/mystery_movie_monday_megathread_april_15_2024/
https://www.reddit.com/r/AMCsAList/comments/1bnx4p2/amc_screen_unseen_megathread_apr_15_2024/
The theaters add state and/or local tax to the $5.