Whats the movie where these bugs eat people (theres a lot I know)?

the only thing i can remember is these ppl were in a movie theatre eating popcorn and there was these bugs in the popcorn and this guy almost ate them. behond the ppl was a person who was being devoured by the bugs but they didnt notice. then i remember at the end these ppl found the nest or something and it was a giant cockroach like thing and they killed it then the girl was driving down the road and its arms grabbed her at the end. i think its in the 90's cauz thts when i remember watching it