My first one dealt with a big black baldy cow some friends had. She had a crescent moon on her forehead like the one you see on the "Jaws" movie posters, so they called her Jaws.
We were working their cows and I had been warned about this cow and not to look her in the eye.
I got busy and wasn't paying too much attention, sudden I looked up and straight into the eyes of Jaws. She snorted and came at me, never knew I could clear a 6' fence. I stayed on the other side til she went through.
Another time I was checking cows a couple of years ago. Well my dog was going into the pasture "visiting" the cows and stirring them up. (I didn't know this at the time.)
Found a cow that had calved by a shed in a second corral. Went to see what she had. What I didn't know was my dog had followed me down there. Cow put her head and charged. I had my back to the closed shed, nothing was at hand but my baseball cap.
I started beating the cow across the nose with the cap the whole time screaming my husbands name. My sunglasses went flying, the dog started barking, cow was bawling and I was screaming some pretty unpleasant things at the cow, the dog and the husband.
I was able to get the cow to back off enough to make a run for the wood planked fence. Made it to the top and waited for the hubby.
Dog has been tied up for every calving season since.