I came home on Tuesday after running errands to this on the side of my house. Its a freaky fuzzy yellow caterpillar with black spikes. Not surprisingly, a search for yellow fuzzy caterpillar with black spikes immediately goes to the American Dagger Moth Caterpillar. I guess they aren’t are rare as I would have imagined.
American Dagger Moth Caterpillar (next to my doorbell)