I was in a work trip once and got on the plane, put on my noise cancelling headphones and started listening to music. My co-worker sitting next to me had his headphones on and was playing Angry Birds. After about 5 minutes I realized that I felt like I could hear the Angry Birds music… I removed my headphones and my coworker was blasting his sound, and apparently didn’t realize that his headphones had never connected. I let him know and he was very apologetic and embarrassed. When he fixed it several people sitting around us thanked me.