I'm a diabetic and the bottom of my feet are numb so I don't always get a good feeling about foot placement (then there are times like yesterday when I'm just clumsy).
Long story short - I fell down the damn stairs - which means - I BUSTED my ass on the first step, slid down and busted my ass again on the next step, and did that all the way down to the bottom.
Bottom line - I broke my ass (feels like it anyways)! It hurts like a bitch to sit, it hurts to try and stand up and it hurts to laugh.
This explains it perfectly!
https://youtube.com/watch?v=4VgaqOXUCJA