Well duh Cat's always the best, especially when it comes to clunky old BHLs... clearly... the operator was doing some type of dozer work and the machine was moving so fast when it slammed into a pile of dirt, the backhoe part slammed into the cab! The loader arms were strong enough not to break, but the pin holding the backhoe had a different fate.
Okay so what really happened? That looks kinda terrible... hopefully no injuries?
(note that the first comment was said 100% in sarcasm -- and radd16 -- though this edit comes after your post, it wasn't mean to reflect your post.
I just wanted to make sure I stated that it was a joke)