You Can't Make This Stuff Up

I met a friend of a friend of mine not too long ago. Out of habit, I extended my right hand to shake his, but he didn't respond. I looked down at his arm and noticed he was wearing a cast. I didn't ask how he did it, I just apologized for not seeing the cast before gesturing. I asked my friend a few weeks later what happened to the guy's arm. This is what he told me:

"He was out walking his dog when a goose came up and attacked the dog. He tried to intervene to fend off the goose but he tripped on the leash and fell to the sidewalk breaking his arm."

I was stunned for a long time as I tried to find which part of that statement to make fun of first. It was humor overload.