Knock Knock, Orphan

Listen up, lil' buddy. This joke is funny because it plays on the sad situation of being an orphan. The orphan in the joke doesn't know who their mommy is, so they ask the person at the door if they are their mommy. It's a dark and morbid twist on a kid's knock-knock joke. You probably wouldn't get it because you still ask your parents to cut up your steak for you.