A long time ago I remember reading a thread about signs that someone is interested in you, the one I remember the most clearly is that they'll look at you if they see or hear something funny. It helped me resolve exactly one potentially uncomfortable situation in my life, making it by far the most useful advice I have ever gotten from reddit.
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29 WHAT MOMENT IN HISTORY THAT'S HARD TO BELIEVE IT ACTUALLY HAPPENED
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18 RULE 34 ARTISTS IT LIKE ON THE FIRST TIME YOU STARTED DRAWING PORN
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30 WHATS THE BEST COMPLIMENT YOU HAVE EVER RECEIVED