用于开始一个讨论或分享观察到的有趣现象，用来引起对话的兴趣或思考。
Have you ever noticed how quickly time flies when you're having fun?
Have you ever noticed how people tend to talk louder when they're excited?
Have you ever noticed how some songs bring back vivid memories?
Have you ever noticed how much better food tastes when you're really hungry?
Have you ever noticed how much nicer the weather is after a storm?
Have you ever noticed how some people always seem to find the best deals?
Have you ever noticed how pets seem to sense when you're feeling down?
Have you ever noticed how your mood can affect those around you?
Have you ever noticed how laughter is contagious?
Have you ever noticed how different places have distinct smells?
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