Terry dropped his Saturday morning paper and ran to see what was up.
Alice stood stiffly at the screen door, gaping out. Terry touched her shoulder and she flinched, startled. Then she pointed.
Terry looked, and his jaw dropped.
The back yard was covered in a three- or four-foot layer--mass--of wriggling sickly white worms, the leading edge of which was rapidly approaching their house.
"Jesus, that's impossible!" Terry said, feeling the bottom drop out of his stomach. He grabbed Alice's arm and tugged her away from the door. "Quick! Upstairs, in case they somehow get in the house. The cell phone's in our bedroom. I'll call for help, and we'll stay put till the police get here."
They didn't make it upstairs. There was a violent grinding noise as the back out the house caved inward toward them.
"The basement!" Terry pulled Alice out of the hallway into the kitchen. They barely got the basement door closed and locked behind them when the entire house collapsed in upon itself.
They hurried down the steep flight of steps, and Terry flipped the light switch.
They didn't even have time to scream before a tidal wave of worms moved across the basement floor and settled smotheringly over them.
(Submitted in the 250-word maximum category.)