I am able to tell who someone is simply by listening to them breathe, or listening to thier footsteps, or smelling them.
For instance, my aunt had come to visit without telling me, and when she entered the house she stood behind me and I knew she was there because she didn't smell like my immidiate family. (Another odd thing is that I can tell when a woman is on her period by smell, too. I can tell without having to get close, she just has to walk by or I have to sit in a seat after her.)
(I can also smell places on people.)
For instance, my aunt had come to visit without telling me, and when she entered the house she stood behind me and I knew she was there because she didn't smell like my immidiate family. (Another odd thing is that I can tell when a woman is on her period by smell, too. I can tell without having to get close, she just has to walk by or I have to sit in a seat after her.)
(I can also smell places on people.)

Hounds do this.
There is a guy at work I can do this with, though. His breath is like a decomposing rat farting in a sewer on a hot day.