I’ve heard this before but never heard it completed. I know it goes along sometimes with “Is the pope catholic?”, but I’m afraid to ask my mom what the answer to this is because I think it’s dirty.
“Is the Pope Catholic? Does a bear ______?”
What is the last word in this?
Merla
Does a bear shit in the woods?
And that is sometimes followed by “Does a porcupine piss on a flat rock?”
Or, if you prefer, “Is a bear Catholic? Does the Pope shit in the woods?”
DOES a porcupine piss on a flat rock? Is that really common knowledge? Raise your hand if you’ve seen a porcupine piss.
I’m going to put that line on bumper stickers.
Is the Pope Polish?
A bear and a rabbit were taking a poop in the woods. The bear turned to the rabbit and asked, “Do you have a problem with poop sticking to your fur?” The rabbit replied, “No, not at all.” So the bear picked the rabbit up and wiped his ass with him.
Is the Iraqi Information Minister economical with the truth?
Actually, at least in mating season, porcupines piss on each other.
Damn you Q.E.D. I was all set to tell that joke! 
Doesn’t everybody?
OK, I’m glad it’s shit in the woods- for some STRANGE reason I thought it was “Does a bear masturbate?”. Maybe it’s just because I’ve seen that horrid thing, the masturbating bear on Conan O’Brien.
Merla
Yay. Conan has inextricably linked bears and masturbation in our minds.
Do the catholic woods shit on the pope’s bear?