Did you hear about Hellen Keller falling down the well?
She screamed her little fingers off.
Hellen Keller's Accident
Explanation
Explain Bear
Listen up, genius. Hellen Keller was blind and deaf. The joke is that she wouldn't be able to scream since she couldn't hear, and she wouldn't be able to feel her fingers being torn off. It's funny because it's morbid. You probably think period jokes are funny, don't you?