I hate leaving bad reviews, but this is one of the only places in Montreal that I not only had a bad experience at, but have actively boycotted.
I went here with a friend, ordered some poutine. For whatever reason to-go wasn't an option just then, so when we picked up the food and drinks from the counter ourselves we just ate it at one of the tables inside. Afterward, we weren't entirely sure whether to leave a tip (as we hadn't actually been 'served' by anyone), so we decided to just leave a modest tip in change on the table as we left.
A large older woman (ostensibly Mamma herself) chased us as we exited and literally THREW the change at us, apparently angry that we didn't tip enough for the privilege of serving ourselves.
(Poutine was fair-to-decent albeit overpriced, I suppose)