The biker's wife met them at the door, and explained the shaking was the worst in the second floor master bedroom, and led the crew upstairs.
She said "There's a freight train that passes by every afternoon between 2 and 2:15, so why don't you wait here while I go downstairs to get the laundry, and you'll see how bad the vibrations are".
While the wife was down getting the laundry, the biker came home early from work, and went upstairs to the bedroom. When he saw the 4 men standing in the bedroom, he asked "WTF is going on?"
The builder sheepishly looked at him and said, "Your wife told us to wait here for a train"..........
![Dunno](images/smilies/modern/dunno.gif)