The Fine Brothers, Benny and Rafi, have a wildly successful YouTube channel.
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A lot of their videos are hilarious. This one — which Quartz's Christopher Mims tweeted — is no exception.
Here, the kids react to a portable cassette player, aka a Walkman.
Some of them think it's a phone. And then they realize it's not:
They have no idea what this thing is:
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And none of them can figure out how to make it work:
"So when you wanted to hear a song, you had to press the fast-forward button and just guess."
"I prefer my iPhone over this thing! This thing is so hard!"