There were two stalls in the bathroom. Feet were visible under the first stall. The other was a larger handicapped stall. No feet were visible. I opened the door and started to walk in but was stopped in my tracks when I saw that this stall was occupied. A gentleman of about 55 was sitting on the toilet, pants up and fastened - the way they might be if he where sitting on anything else in the world. Hw was reading a book and drinking coffee. He did not so much as glance at me as I stood there. Instead he kept reading and sipping his coffee. I quietly backed up, shut the door and high-tailed it to another bathroom where everything went as planned.