Have been a regular at Square Boy for years, just like most of the East Enders here, usually getting the chicken souvlaki on a pita. Souvlaki is succulent and not greasy - the seasoning is to die for (making the souvlaki tastier than at all the Greek restaurants on the Danforth), especially when combined with their in-house tzatziki and lemon sauces. For under $5, it is very filling and perfect for late night cravings that don't make you feel bad about yourself. Make sure to get extra tzatziki! Their milkshakes are really tasty as well. I have often joked that if I were rich and famous and wanted food flown in, Square Boy chicken souvlaki would definitively be a regular feature.
The decor is old school diner but tightly packed - better for a quick bite than hanging out with friends for a long time. There always seems to be a line no matter what time of day, but the wait for me has never been too bad. Free parking is probably a great perk for some, but I usually crave Square Boy later at night when it is free on the Danforth anyways. Location is close to Donlands for those taking the TTC. Though it is a quite no frills place, one thing that prevents me from coming more often is lack of debit/credit card payment options.