I was accosted by a big horn sheep years ago, in the Canadian Rockies. (It was mid summer, so it wasn't the rut or anything.) This thing wanted to lick my arms...presumably for the salt! I had to get pretty rough, to get rid of it....
Also got molested by a deer in my local mountains (San Bernardino NF). It walked right up to me (a smallish doe), like it wanted a handout of some kind. When I didn't come up with anything, it started striking at me with its front hooves. I had just returned from a dirt bike ride, so I was in full motocross gear (helmet, goggles, boots, chest protector, etc), so I wasn't going to take any crap from this critter! I wacked it a couple time in the muzzle, and grabbed its legs and tripped it up when it tried to strike at me. (Plan B was a knife blade in its jugular vein, seeing that I had an Emerson CQC-10 clipped on my pocket!) It finally backed off a ways, and stood there and watched me the whole time while I loaded up my bike and took off.