Blue sky, clear, warm - but not too warm. No humidity, birds chirping, you name it.
I'm almost done with my run, happily chugging along the country roads near my house and feeling quite satisfied with myself, as I am want to do in such situations.
I'm listening to my music, thinking about everything but running, and a *@&#^!$ DEER runs out in front of me, about 15 feet away, bounding out of the woods, across the road and into the woods on the other side. For the record, that is way too close.
Holy Mother of God, I almost had a heart attack.
I instinctively yelped something like, "GAAAAAH!, but amazingly did not fall out of stride, trip or pull something from the shock. I wish I was wearing a heart rate monitor at the time as the read-out would have been hysterical.
I've seen rabbits and turkeys on a run, but nothing as big, quick or fast as a deer.
I don't know if it's because I've watched too much Law & Order, but I always run a little on guard, half expecting a pervert, serial killer or coyote to bound out after me. So to have an actual large mammal come flying out of the woods was too close to realizing that than I ever wanted.
I only had about a half-mile left in the run and I swear my heart rate didn't get back to normal for a good half-hour.