Waiting for the Train

 A woman asks a carpenter to fix the wardrobe in their house, because when the train is passing by the house, the wardrobe shakes and makes noise. When the carpenter arrives to the house he tells the woman: "I'll go inside the wardrobe and close the door, and when the train passes by I'll check which part of the wardrobe has this problem."
A few minutes later the woman's husband comes home and opens the wardrobe. He sees the carpenter and asks him "What the hell are you doing here?"
The carpenter says: "Will you believe me if I say I'm waiting for the train?"