my $0.02...
it's clever, but it would probably be pretty easy for the victim to figure out something was fishy if they actually scrutinized their credit card statement. instead of being charged directly to the movie theatre location, as it likely would be if some real person from the theatre had run the transaction, it would read as being from whatever online movie ticket vendor you used to buy the tickets, and there may be an extra convenience charge for buying online instead of through the actual cinema.
as far as you getting caught as the culprit...if you did it to only a few people, or beiged different movie theatres to get your numbers, i doubt you'd get busted as long as you made sure to not get caught beiging, and not leave any traces behind. [this goes, of course, to the normal risks of beige boxing.] if you stole enough numbers from one theatre that they got a lot of complaints about people getting funny credit billing sources or convenience charges on phone orders, it would, of course, be more likely to trip an investigation. an investigation would be bad news, as i think there's probably a way to trace the transaction back to where it was completed. so, you'd probably be fucked if you were using your own cellular internet account, or your own wireless hotspot account. you'd either have to be on a stray unsecured wireless network, or have a hotspot or cellular internet account that you couldn't be traced back to.