The Outdoor Orphan

Listen, you’re the type of person that probably still believes in the tooth fairy. So, here it is: The 'joke' plays on the word 'mother.' The orphan doesn't have parents, which is sad. The punchline uses "Mother Nature," to imply that the orphan gets a mother by sleeping outside in nature. It's a bit dark, but kind of funny if you think about it, since orphans don't have parents and Mother Nature isn't a substitute.