Well, OK, that's not all that uncommon. But it has been for me.
The very first landscaping I did when I moved in here 27 years ago (new house so no initial landscaping) was plant a few shrubs on the east side of the house. It was a Korean Dogwood tree with 2 Euonymus shrubs, several Nandina (false bamboo) plants, and some spreading evergreen.
Well, nothing bothered the shrubs in all that time. Until last week! But as I walked around that side of the yard (a least-visited side), "something" just looked odd. It took a few minutes, but I realized all the bottom halves of the Euonymus shrubs looked "wrong". It hit me suddenly that all the leaves on the bottom half of the 8' high Euonymus shrubs were GONE!
Well, sometimes it takes a few minutes for the brain to "see" the difference between what it is looking at and what the memory says was there before. So many possibilities came to mind. Insect damage? Not in Winter. Fungal disease? Ditto about Winter. Natural leaf fall? No, it's an evergreen.
When I moved into to this newly-built neighborhood, there were deer around. There was a swamp across the street and deer love wetland edges. I almost got trampled by 2 panicked deer while I was mowing the lawn my first Fall. I used to see deerprints in the lawn at first. That all stopped after a few years as the street filled with new houses.
Last year, I had some hostas eaten for the first time in 15 years. This Winter, shrubs for the very first time.