I know I should be grateful that people send me christmas cards and I should stop being such a humbug but it really annoys me when I get a card that doesn't have "To Tommy, DH, DS1 and DS2" and just says "from whoever....." So they've just spent the whole evening signing their names in cards and not think about the person they're sending them to at all. 
Why bother sending cards of you can't be bothered putting the person's name in it?
Sorry....rant over 