I went to see "Past Lives" (highly recommend) and of all the previews Barbie and Oppenheimer were the two I resolved to see. On separate days, though, I can't imagine doubling these two up. Do people do this to save money?
I'm not doing a "double feature", but I am seeing both opening weekend, which is something I haven't done in a long time.
My local film society got a 35mm print of Oppenheimer, which I have tickets to see opening night. Barbie on the other hand I'm happy seeing on a digital screen closer to home.
In our multiplex (US) I could go from theater to theater since the seats aren't assigned but I've never done that, even though I complain about high ticket prices. It's not "legal", of course, but I doubt the bored teenagers would go around hunting down cheaters.