Most of my jokes would offend someone. But here goes on one that shouldn't offend anyone.

So when you go camping in bear country it is always good to make some noise so that the bears know you are there and they will generally leave you alone. I was out camping with some friends from out of state so we put bells on our shoes to let the bears know we are there, a common practice with campers and hikers.
As we're hiking we come across some bear poop. I quickly identify it as being black bear poop. My friends, surprised that I could so quickly tell asked me how I knew it was black bear poop. Easy I said, grizzly bear poop has bells in it.



Not the funniest joke, but for some reason I always get laughs when I tell this joke.