Like Matman says, they come in lookin for action.
First deer came at me from the bottom of a small draw sprinkled with saplings. Ears were laying back, waving his head from side to side- it was me or him!
second deer was a just wandering the side of the hill about 20 yards away, never even new I was there.
#3 I was setting up on a big buck about 200 yards away. He was holding a doe but I had high hopes. I waited till the wind was right then sprayed the scent-just then a gust blew it in my face, I felt like a fool when it happened a second and third time! I sat down and only waited about 3 minutes. 3x3 coming uphill to the scent. ears back, head down doing the whole side to side thing. At 50 yards I stood up, at 40 I waved my arms, at 30 I whispered loudly "go away!", at 20 I moved a couple of yards to my right, when he changed direction to follow, I punched a hole in him at about 15 yards. 1 of us was going to get mounted-he looks good on my wall!