I usually get one or two really fantastic cards for my birthday. The one that's held a special place in my heart to this point has a black and white picture of two kids sitting on a dock in their bathing suits, staring out onto a lake. The caption reads, "It's your birthday. Sit back. Relax. Wear a bucket on your head. Whatever."
For me, the card has this really palatable quasi-taoist philosophy behind it, like, chill out buddy, accept your idiosyncrasies (of which I have many). Wear that bucket on your head and don't let anyone make you feel bad about it.
This year the bucket-head card has competition. The card is white, unadorned. No images on the outside, just the following statement, in plain bold helvetica:
A disturbing birthday greeting card that shows a black and white photographic image of a semi-nude elderly lady. She is standing in a non-provocative pose, revealing her breasts.
Inside the card is nothing (except for the card giver's message, which is itself quite glorious and signed 'the Squid').