给出一篇开放式生成的故事开头。故事应包含一个人物、场景和情节。
Lana was sitting alone on the park bench, staring at the sky. It was a warm, lazy day and the clouds were slowly drifting by. Suddenly, she noticed a small, brightly colored bird perched on a nearby branch. As she watched the bird, she felt a sudden sense of unease. Something about the bird seemed off, like it was watching her too. Curiosity got the best of her and she walked over to the bird, but as she got closer, it flew away. Lana tried to shake off the strange feeling, but as she walked home, she couldn't shake off the feeling that something was wrong.