last argument

My dad believed that I had taken the ear piece that connects to his cell phone. He believed that I took it with myself down to Mankato and when I returned home two weeks later I acted like I had just found it laying on the floor(which I had). I told him I had found his missing earpiece in the computer room on the floor behind the table. He said that he had searched the computer room and found no such ear piece and also claimed to never had been in the computer room. My counter claim was that the ear piece had been missing for over 2 weeks and I recall seeing him in the computer room with it, also what reason would I have for taking a ear piece that probably does not work with my phone. We never resolved the argument I just walked away.