Poutine is another famous Montreal dish, especially after a heavy night of drinking. La Banquise is open 24 hours and a perfect way to end a night with friends in the Plateau. There is usually a ton of people waiting at any given time, but especially later in the night.
There are two lines, one for take out and one for sitting in the restaurant. I usually just get in the to go line. The wait can be awhile even after you order since the restaurant is so busy. They have a ton of variations on the poutine and most of the ones I have had are good. The best I had was one with all the different meats on it, forget the name.
But if you find yourself partying in the Plateau stop by La Banquise for your post boozing meal!