Two from memory, though they're long gone;
A few years back, a place in St. Augustine built a 1 lb.+ burger with fries and a dill pickle. Good, but not a particularly great burger, but if you finished it, you got a coupon for a free burger on your next visit. Until they wised up, they would give a coupon for a free burger if you finished the free burger. I had a lot of free lunches on that deal.
The apartyment I lived in during the Disco era had it's own nightclub. Hated the club, but on Friday nights until 8pm, they'd sell a 1 lb. burger with a beer for a buck. Saturday mornings, it was steak & eggs w/ a Bloody Mary or a Screwdriver for a buck. Saturday night was wet panty night, but that's another story.