I thought this was cool at first now I find it irritating and frankly a little disappointing/creepy. Long story long, a friend sends me a panorama inviting me over to his house to hang out with friends. When I open the panorama from messages on my iMac a song that I do not have on my computer starts to play. When I close the panorama it stops. Here is a video of it. https://youtu.be/y5XG1ut4JmE So I thought, hey thats cool. Neither of us can explain it so I message that video to him. (Song is from Neon Indian btw). Now when I open that video I sent him (the one above) in Messages on my Mac I get a Nissan ad on top of the original video. Keep in mind this is a recording of a recording so it should sound and look exactly the same (with the lose of quality from recording a recording) however nothing should be added. Here is a video of that. https://youtu.be/cA6phieGQBA None of my other devices (iPad and iPhone) play this additional audio when viewing the originals in iMessage. What the heck is going on? First why is there additional audio being added to my panoramas and videos in Messages? Secondly where is it coming from?! Third, how do I stop it? I don't like the idea that my iMac has taken it upon itself and is somehow connecting to an outside source while I'm viewing messages.