Plenty of very serious news stories have an element of humor. Take the one about the house at 9716 Watercress Drive in northwest Fort Worth.Rather, that would be the one about the slab at that address, where a house used to be until a city contractor removed it on July 12.Wiped it clean away. By mistake.The condemned house next door at 9708 Watercress Drive is the one that was supposed to go away.Think about how David Underwood felt. He owns the property, the former house and the now-clean slab. His day job is as development director for the United Community Centers, and the house formerly belonged to his grandmother.Probably every homeowner knows the feeling of having been away from their property for a while and experiencing a touch of anxiety driving up to it again, taking a fresh look and then breathing a tiny sigh of relief on seeing that everything is OK.Underwood and his wife have another home in southwest Fort Worth, and they had just returned from a trip to Boston. They hadn’t been to the Watercress house, which was vacant, in a month, Underwood said.So they were driving up to it last Saturday, waiting for that first glimpse of the house, but the tiny sigh of relief never came. Now think about how Dennis Shingleton’s assistant felt. Shingleton is the City Council member whose district includes Watercress Drive. His assistant took the call on Monday when Underwood wanted to know where his house was — or to be more exact, why it wasn’t where it was supposed to be.What’s that, you say? You can’t find your house? Is this a joke?If only that had been a prank call.So now the very serious part happens. Somebody, either the city or the contractor, probably, owes Underwood some money. He says they’re all trying to figure out how much.Fortunately, nobody was hurt and nobody is homeless. But somebody has some very serious explaining to do.