A man tries to build a house. He has a few of his neighbors come to help. They are working very nicely and organized-like, like you would expect from people who are trying to build a house. Yet they are all amateur carpenters, masons, and architects.
Soon, a building inspector comes by. "Those stairs don't meet the building code," the inspector says, pulling out a tape measure, "and by these measurements, they will collapse when anyone over 50 lbs. weight gets to the fourth step."
The builder replies, "Well, that's OK, because we'll just rebuild those if you give us a little time."
The inspector moves on. "This wall isn't supported enough," the inspector says nonchalantly. "It's load bearing, but structurally unsound."
"Of course not," the builder replies, "We're going to put up other walls next week that will be even better! You'll see!"
"And look!" the inspector cries, "The foundation appears not to be concrete, but gelatin mixed with kindergarten paste! The owners of this house will be angry indeed when the rains come."
"They won't!" the builder retorts, "Because when it's done there will be a ceiling!"
The inspector walks away, shaking his head because the builders will always have an answer. Then when the house is finally occupied, and all the party guests come by, they were killed when the stairs collapsed, the walls fell in, and the floor turned to water.