Figured I'd resurrect this thread with some new stories!
Harry Potter and the Goblet of Fire: Two women almost got into a fight over a misunderstanding regarding seats (this was before the days of assigned seating's in movie theaters). Fortunately, this happened before the previews started and everything was quickly resolved.
A Wrinkle in Time: JUST as the Disney intro was ending, the fire alarm went off due to burnt popcorn at the snack counter and the entire AMC had to evacuate everyone. My friends and I were forced to leave but thankfully we were able to get refunds.
Black Panther Wakanda Forever: Two oddities during the trailers in IMAX. First, most of the previews were perfectly suited......except for the first one M3gan. Why the hell did we get a horror movie trailer when everything else was action, Disney or otherwise? Also, the Dungeons and Dragons trailer had a glitch on it where it caused a VERY loud buzzing sound over the entire thing, drowning out the audio. Everything else went fine.