Popcorn at the movie theatre

Question

I do know and realize that going to the theatre is wrong and against Halacha, however i do know people that do go and do eat the popcorn there, now setting aside that going to the theatre in general is assur, is there any kashrut problem with the popcorn there, i was always under the impression that the popcorn machines were greased with pig lard, and maybe even the oil is a problem, is that a correct assumtion or am i totally off on this one? i just want to make sure that at least there shouldnt be two issurim. Thank you for your help, Tizku Limitzvot! Hag Sameach! Eli