I lived in Alaska for a few years as a kid. There were two incidents at the zoo in Anchorage involving the pair of polar bears they kept.

The first incident did not recieve much media attention, because it involved minors who recieved MAJOR injuries. They wanted to go swimming one summer, none of them had a swimming pool, so they jumped the zoo fence late at night and checked out the polar bears' pool. They got mangled, I don't know if they all survived, but one certainly made the Darwin Awards by not being able to reproduce anymore.

The second incident DID recieve national attention. You'll even find video footage. The lady hopped the 3 foot wooden fence and got too close to the large iron bars to get a closeup photo of a "sleeping" polar bear. He reached through the iron bars and grabbed her foot. She was pulled free by other nearby visitors sustaining fairly minor lacerations(considering she was in the paws of a polar bear), but the bear made away with her red shoe. The bear carried the shoe around in its mouth, almost as if it were a trophy, prancing around the enclosure for some time. If a bear could ever have facial expressions that said "Look mommy! see what I did! I caught one I caught one!"...

The zoo for a time, and perhaps still, sold keychains of a polar bear with a red shoe in its mouth, with text saying "Binky's Catch And Release Club".