It's easy to know to respect the ocean when it's writhing, foaming, and thundering against the breakwater. It's easy to forget to respect it when it's placid, calm, and lapping against the rocks.
Even though the ocean may appear calm on a given day, it turns violent faster than you can say "Jack Robinson, hand me that pole". In the same way that you'd be careful when encountering a placid-looking lion relaxing in the afternoon sun, it's a good idea to bear this angry scene in mind and take care when encountering the ocean. Remember, the ocean's always angry. :)
Compare these two photos of Three Anchor Bay with the ones below - quite a different vibe, hey?