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In one eye and out the other 

Something visually boring - to the point of your eyes losing focus - that numbs your brain.
A sermon from dad elicits the "in one ear and out the other" response while a friend's boring home movie gets an "in one eye and out the other" reaction.

In one eye and out the other 

When someone shows you how to do something and you pay no attention whatsoever and therefore cannot do the thing they showed you to do
I know I just watched you put that windshield wiper on the car… but it just went in one eye and out the other