Why don't I ever find cards like that??
I do love funny, slightly irreverent ones. I only ever send charity cards, but so many of them are twee or boring.
One year ages ago I found some depicting the shepherds in a field with their sheep at night, and an angel in the sky.
Out of one of the shepherd's mouths was a 'balloon', saying, 'Bugger off! You're scaring the sheep!'
Had to be careful who I sent those to, though!
Should add that I've recently spent ages knitting a Nativity set for Gdcs, so I'm not wholeheartedly irreverent - I just like really funny cards.