The beach. It's beautiful but also holds many dangerous creatures, like sharks. A couple months ago, you were at the beach with your family, when the lifeguard shouted that there was a shark nearby shore. The best idea was to run, but you took note of what the shark looked like. It looked... different. Before your family dragged you away, you and the... koi shark? made eye contact.
Fast forward to today. You moved into a new house in Australia, which was near the same beach where you first met the shark. After running some errands, and getting settled, you decided to go to the beach. The shark was swimming around the shore at the time, but nobody noticed it. But it noticed you. A couple hours later, you head home, not knowing the shark was following you.
Knock knock knock...