Dude kept demanding to talk to random PhD. Had to say "I'm not his secretary — I'm not not doing you a favour. I don't know who this is." 

I think @chbergma has had similar experiences. I hate how they react like I am holding back. I just do not know the person!!
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I'm so sorry to hear that. I mean you're a scientist, not some private investigator!
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yep! the guy probably thought I wasn't to be honest.
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That's pretty odd for someone to think that about you.
End of conversation
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