My worst mistake didn't happen, because luckily (?) we couldn't afford to cut down the huge evergreen in our new front yard which appeared to be completely dead soon after we moved into the house on the hill in Rochester, NY. (This was almost forty years ago and I remember it vividly.) We looked out at that "dead" tree ruining our view and hoped we'd be able to take it down soon. In Spring, it came alive gloriously and we enjoyed it for many years except for its "dead" period in winter. Someone identified it later as a metasequoia. I'm not sure that's what it was - I don't find that metasequoias shed their needles, and apparently they're pretty rare. I drove by that home every time we visited Rochester for many years and it was still there last time I looked.