Can't believe how many people I know that live in other provinces, but still know about Peter's Drive-In, and make time for a stop while in Calgary.
Definitely a Calgary treasure! Great food, reasonable prices, although line-ups are frequent - they typically move quickly, lots of parking, tables around if you prefer to stay. Still have not caved to electronic age - it's cash for food, and all staff adds up amounts with pen on paper.
Milkshakes are tastely, and usually so thick that it takes a few minutes before you can actually use a straw! yum.
Never been - you must try.