Waiting for a train

A biker and his wife bought a new house close to the railroad tracks. Every week, the biker's wife called the builder and said the house shook uncontrollably when a train passed by. After 3 weeks of phone calls, the builder took a crew out to the house one afternoon.
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"..........