Here's another $10 bill with a very similar error...
{http://img651.imageshack.us/img651/1428/bfj7201521errorc.jpg:http://img651.imageshack.us/img651/1428/bfj7201521errorc.th.jpg}
(error note on top; regular note on bottom)
{http://img39.imageshack.us/img39/402/bfj7201521error.jpg:http://img39.imageshack.us/img39/402/bfj7201521error.th.jpg}
This time, the thread tapers upward, in contrast to Baanos' note which has the stretched part toward the bottom end. According to the serial number and position numbers of the note I've shown here (BFJ 7201521 58/78), it comes from the top of the sheet, so I would not expect the notes printed below in the same column to exhibit any thread errors.
The note belonging to Baanos comes from the middle of the sheet, and that would mean there could be some $10 notes with even more dramatic stretch errors out there.
This would seem to be a new kind of error deserving a place in the catalogue.