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There's a bunch of them and quite often they make the movie or TV show worth watching.
They add comedy or drama or respite from the lead actors.
I'm guilty of saying oh, it's that guy/gal who was in xyz movie and never learning their name.
Here's one...
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I knew the name Vincent D'Onofrio, but I don't think I would have put a face to the name before I saw him in Daredevil (especially with one of the previous "faces" being Edgar in MIB).
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I learned his name after watching 13th Floor