How to make friends with your officemate

Shortly after moving into my new office I decided to listen to the radio. I plugged my cheap headphones into the jack and turned on the radio. I didn’t hear anything so I turned up the volume and fiddled with the position of the wires (that’s how you get cheap headphones to work.) Not even hearing any crackly static, I turned the volume up louder. I was able to hear the music faintly so I turned it up some more but then realized the sound wasn’t coming from the headphones but from the radio speakers. My officemate was glad to know that instead of trying to blast him out of the office with my radio I was just being dense and I hadn’t plugged the headphones in far enough.