There is a perfectly logical explanation for this. It's actually related to how subliminal messages work.
When you look at something, your brain knows what it is, and processes understands it with much greater detail than your conscious mind can. You only clearly identify it afterwards. It saw some sign that probably meant that the shade was going to fall, and you just articulated the feeling. The brain can actually see the individual movie frames fast enough to pick up subliminal messages. You don't know this with your conscious mind, but the information is in there, just not fully processed. Animals live in this state.
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