Why? You don't need to be a super chemistry nerd to understand or even extrapolate form clues that those are representing water molecules...I feel that sometimes people think they are in a special club with knowledge about a subject or something, but really most things are a Google search away. Also, are chemistry nerds generally without friends, or even asocial?
This is some big bang theory level humor
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.... So what happens if you don't get the joke but also have no friends? Asking for a friend.