The phrase "something goes in one ear and out the other" refers to a situation where a person completely disregards or forgets information that they have heard. There are several other phrases that can be used to express a similar sentiment, such as "it falls on deaf ears," "goes in one ear and out the other," "doesn't register," "doesn't sink in," "doesn't stick," "doesn't penetrate," or "doesn't compute." These expressions all describe a situation where information is delivered but not retained or acted upon by the listener. It's important to listen actively and engage with the information we receive to avoid becoming guilty of this behavior.