If you're into films or free things I would highly recommend visiting Forum Des Images, which is found in the underground mall/shopping area of Les Halles (Metro Les Halles). They're always screening independent films and classics usually centered around a monthly theme so walking there is like walking into a constant film festival, except more tranquil. For 5euro you can usually get one big screening and then two hours in the Salle de Collections. There are different ways of mixing what they offer for similar prices at the entrance and they also have a yearly pass for 80euro.
Every day after 7:30pm (19 h 30) you can go into their Salle de Collections for free. There are couches and flat screens computers with a variety of classic films that you can view "gratuit" until they close at 10pm. At the entrace of the Salle you exchange a pair of huge headphones for an ID, and you're golden. Good for watching with another buddy or a date, but not in groups. (There might be a max of two people per screen, but I'm not entirely sure.)
In any case, with a friend or solo on a lovely cold evening, enjoy your French classics! :)
