I remember being in Bali when a macaque attacked a passenger getting off a bus - I immediately lowered the camera, and stood there transfixed. Would have made a great shot.
Now, four years later, clicking the shutter when something unexpected happens is something I am getting better at. On today's walk with the dogs I was on the other side of the farm fence when this happened. My reflex was to click away. BTW, Sippos is fine.