I've always put it as 'do bears crap in the Vatican?', which had Micca rolling on the floor the first time I did it accidentally.

Oh and on papish things - 'Does the Pope have a balcony?'

'Is the Pope Jewish?' (well he wears a little yemucha)

'Are rabbits glad bears use Charmin?' (from an advert for Charmin loo paper, where bears crap in the woods with a roll of this paper nearby, and from the joke - bear to rabbit 'Does shit stick to your fur?' Rabbit to bear - 'No, why?' Bear grabs rabbit and wipes his bum with it.)

LTS