Denny’s almost never closes…

Denny’s has been famous for decades for their 24-hour promise all 365 days of the year—if you want breakfast food late at night on a Sunday, Denny’s has you covered. But the problem with this policy took a few years to show itself: When almost all the Denny’s locations closed for Christmas Day in 1988, many stores realized that they didn’t have any keys, or even locks, since they never used them. All told, 700 of the 1221 restaurants needed to get new locks installed for the holiday.