My wife had laundry in earlier. When she went down to check on it, the utility sink was full of water and water was squirting out of the drain pipe. Lovely.
We called our regular plumber, who called back and said his drain cleaning machine is out of commission and he can't reach any of his other techs. So I called another company and we're waiting for their guy to come out. Hopefully, this is something simple and will be fixed within an hour or two.