As You Know Bob

As you know, Bob, dialog that provides exposition in the form of wooden dialog where characters lecture each other about things they already know is called "As You Know, Bob" dialog.

Bad name.  Quite bad name.

The problem is not that the person already knows what he's being told.  People lecture each other about things they already know all the time in real life.  The problem is that the conversation is unmotivated.  And some writers mistake the symptom for the cause, and simply introduce, however, implausibly, a character who is ignorant, and then have the character in the know lecture him, however implausible that is.

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