You know, you foreigners have some straaaaange traditions... but what the hey:
HAPPY BOXING DAY!!!
I still don't get what this has to do with the holidays, but hey, goodwill (and devastating right hooks) to all, right?
From All-New Collectors' Edition #C-56 (1978). Yes, that was it's actual name. Because DC had a real crisis of imagination when it came to naming and numbering their series of Treasury Editions...