ear plugs????

A conversation with a four year old is always interesting and today was no exception.

In the car Nathan was being reminded by Oma that he needs to use his listening ears.
Oma: Nathan you have two good ears and you need to use your listening ears to hear what your parents have to say and do what you are told.
Nathan: I do, but I don’t have a plug.
Oma: What kind of plug?
Nathan: You know the kind of plug that is in the wall with the holes. My listening ears don’t have a plug.