The music may be horrible, but if you rub a tape head over these ties you can actually hear jumbled sound collages recorded from the NYC metro system. This is possible because the ties are 50% audio cassette tape.
If you have $90 to spend on one of the ties, and you are willing to sacrifice an old Walkman for the project, you can make this a fixture of your formal wardrobe. Of course, walking around with a broken Walkman asking every one to rub you with it is not recommended. [Supermarket via Gadget Lab]