I remember several deer seasons ago, I was out on opening day with some doe-lure and various other scents laying a "scent trail" to my stand. I would hang a felt pad in a tree and spray some of the deer pee on it.
After a while, I was in the middle of dousing another pad when I got this unexplainable feeling that I was being watched. I looked over my shoulder, and a large 8-point buck was standing not 20 yards behind me, watching intently. I unslung my rifle, snicked off the safety and shot him right there. The tracks in the snow later revealed that he had been following me for quite some time along the fenceline, and the guys in camp later bugged me about how lucky I was that I didn't bend over to tie my shoe! That, incidentally, was my shortest deer season ever - over in 20 minutes!