We always pass by Bang Bang while in the Ossington neighbourhood. The Bellwoods Stout ice cream is surely one to try, especially with the ginger cookies. I would recommend just getting a half ice cream sandwich unless you're going to share with a friend immediately. I take big bites but even the second half started melting quickly before I got to it. Grab some extra tissues.
Service has been pretty inconsistent the 4-5 times I've been. The lines can be very slow and the staff don't seem to be in any hurry. A couple times we stopped by, they were closed despite hours indicating they were supposed to be open (maybe they were all sold out). Still worth a try.