Basically, making a V shape with un-powered "Powered rails" then placing a bunch of TNT minecarts on one block of the rail then powering the rail will then cause a extremely loud noise that kind of sounds like a car engine. The minecarts with TNT in them will then start moving. As the minecarts get faster the more it sounds like a car. If your player stands in front of the moving minecarfts it will explode, launching you extremely high in the sky. My attackment is to large so I will upload it to youtube. ( http://www.youtube.com/watch?v=-mzKfKP9f7Q&feature=youtu.be )
Linked issues
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Duplicate of MC-7867, please use the search function to see if your bug has already been submitted. Currently over 53% of tickets are being closed as duplicate.
Confirmed 13w10a.
I wouldn't call this a bug though.
It's TNT that moves entities and multiple sound...