Getting Some Space.

http://www.newyorkerstore.com/2011/title-another-way-to-keep-an-empty-seat-beside-you-on-the-train-a-man-wears-a-shirt-that-says/invt/137403/
WARNING: THIS WILL NOT WORK WITH FOLK WHO CAN'T WAIT TO TELL YOU HOW WRONG YOU ARE.

Thanks to Judge C.