Boxing Day isn't really celebrated in the USA, but I think it's great holiday. What could be better than a casual hanging out day centered around re-gifting, and left overs?
I've always thought Boxing Day was the day after Christmas, but it seems it's more complicated than that. Apparently, in some places, when Boxing Day falls on a Sunday, and Christmas is on a Saturday, Boxing Day gets moved to Tuesday.
-My leftovers won't last that long.