My stepdad always cut deep crosses into the sprouts, to make sure they got extra waterlogged and mushy
My mother used to put a tangerine in the toe of the stocking, then all the stocking gifts/choc, then fill up any remaining space with tangerines and apples so it "looked full". So if it was a slow year you ended up with a big pile of fruit.
My dad starts on the brandy an hour before Christmas dinner "to numb the stomach" so he can fit more food in.
Any weird and wonderful Christmas quirks in your families?