What type of cultural references, aphorisms, sayings and general linguistic references are most useful / familiar to you?

Have you ever used a reference of any kind where the person you were talking to had no idea WTF you were talking about? Was it an age disparity? Was the person just culturally illiterate? How did you react?

Biblical references
Sports references
Movie / TV references
Literary references
Select gender and age to cast your vote:
What type of cultural references, aphorisms, sayings and general linguistic references are most useful / familiar to you?
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