stuff-jacking is very trendy nowadays : I talked about bluejacking several days ago. Now, there is another concept : ipodjacking : "a few iPod owners have developed a little ritual in which they recognize each other from the headphones, stop, plug into each other's iPods, and share their music for a minute." -> people could listen in on each other's music without first making contact. : "If both parties are clearly enjoying their music the headphone jack is unplugged and offered to the other person. We then stand and listen to each other's music for a minute or so, unjack, thank the other person and move on..."