At the Berlin Zoo recently, a 32 year old woman "climbed down a fence, over a wide hedge full of thorns and got past a concrete wall before swan diving into the murky moat where the polar bears swim." There were 4 adult polar bears in the area.
The woman is now in intensive care after some keepers fished her out.
The zoo says it doesn't plan to change its security measures. I agree. People like this should not be protected from their stupidity.
Here is a video link which shows the keepers trying to fish her out of the moat. The bears seem to just be playing with her!
Hat tip to the Eco Sista!