This is the sort of thing Benedict Cumberbatch - himself a rather magnificent bastard - says to his chums all the time, isn't it?
Know someone who's going through a rough patch? Send a profane pick-me-up to brighten their day.
I love a bit of gratuitous swearing, and I think the reason these cards are so effective is the juxtapositioning (*pretentious face*) of profanity with the sort of calligraphic font normally reserved for wedding invitations. I can imagine hearing the satisfying thud of its heavy card hitting my doormat and thinking this was something VERY formal arriving in the post.
Calligraphuck's cards are £4 each, including birthday, congratu-fucking-lations, and Christmas cards (no, it's not too early, apparently - I've had a press release about it already). And if you reckon you'll still be with your magnificent bastard or bitch next Valentine's Day, they've got that covered, too.
Calligraphuck - I fucking love you.