Mamihlapinatapai

I just came across a list of ten words that cannot be translated into English.  Mamihlapinatapai is a look exchanged between two people who both want to say something while being reluctant to initiate the conversation.  I'm pretty sure I've been one half of that definition.  I have to wonder if there's a word for a time when one person is dying to bring up a subject, but the other person is completely oblivious.  I would be more familiar with that concept!