Back in the 90's when we used to go to Denny's they had something called "The Off Menu." I remember there was a burger that I used to always get, and sometimes I had to help the waitress punch it in.
I also remember when Wendy's was pushing their double burgers they had signs up saying "double your beef for only 99¢." I had friends that would order triple burgers, and then pay the extra 99¢ to double the beef to 6 patties. Wendy's quickly revised the signs.
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