Which was the first movie/show to use a certain characteristic or technique?

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What is the first movie where the audience believes a dream sequence is reality until the character wakes up?

In Spy Kids (2001), Gregorio Cortez almost think that he smash the big guy into windows at school & all kids claps for it. even audience view the scene what he think. But in reality, he actually ...
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Velcro as an alien technology

In many sci-fi movies like Transformers velcro is supposed to be an alien technology that human copy. Which was the first movie in which the velcro is an alien technology?