I, my 2 little children and my boyfriend at the time, stood looking at a stallion that was swiftly trotting around its closed in stable when suddenly it shot its head straight out an open "window" at my quietly watching boyfriend as though to bite him. Why? I was close by, so why him, not me? No harm done, but shees. I walked over to another horse (female-?) and stroked her head. No problem. I felt sorry that the stallion was couped up, but figured its owner had a good reason for doing so at the time.