I had to put a ring of fine mesh hardware cloth around the spark arrestor on my chimney to keep bats from falling down the outer ring of the pipe...
as for on topic...the wildest thing I ever ran across (and this so unbelievable but I swear I am not kidding)...
...in house built by the owner and inherited by his daughter there was an open/exposed "knife switch" (115 VAC) on the wall of a shower in the bathroom...honestly it was in the shower about shoulder height...it powered the only light in the bathroom...
I was originally asked to remodel the house but it would have cost so much just bringing existing utilities up to code made it cost prohibitive...I ended up demo-ing the house her father had built and setting up a 'Wausau' home for her...