I've had quite a few ridiculous injuries, but I think my dumbest self-inflicted injury was when I tried to scare a flock of very loud crows out of a tree. I decided to shoot a 12 gauge up into the branches but didn't have enough sense to not stand directly underneath. Must have hit a branch just right because it crashed down right on my head. All the crows scattered- didn't even knock a feather off any of them. But I ended up with a huge lump on my head and bark scratches all over. Guess it was karma.
My dad always said not to piss off crows. He said they were mean and would come after you, a la "The Birds." Said that he'd seen it plenty of times growing up. Sparrows chase them off, though.