No no you got it all wrong mate, I play the victim. It is 100% sure fire way to get any movie ticket. Just don't hit the same theater twice. All you gotta do is tell em you accidentally bought how ever many tickets for the wrong movie, and either they will give you promo passes or a variation of these. Or they will let you see the movie you wanted to see. In my case I told I wanted to see a movie at a different time/date.
They have 0 reason to suspect. I mean I still ending paying for popcorn for the fam so they get there cut lol.