A man and his wife check into a hotel. The husband wants to go to the bar for a drink, but the wife is very tired from the trip and decides to go on up to their room to rest.
Just as she lies down on the bed, an elevated train passes by very close to the window, shaking the room so hard that she's thrown out of the bed.
Thinking this must be a freak occurrence, she lies down once more. Again, a train goes by and shakes the room so violently that she's thrown to the floor.
Exasperated, she calls the front desk and asks for the manager, who says he'll be right up.
The manager is skeptical, but the wife insists the story is true. "Look," she says, "lie here on the bed ... you'll be thrown right to the floor!" So, the manager lies down next to the wife.
Just then the husband enters the room. "What are you doing here?!?" he shouts.
"Would you believe I'm waiting for a train?" the manager calmly replies.