I've been looking for a classic movie which i have seen many years ago and can't remember his title! it took place inside a train. The only scene i remember was inside the train's dining car, where a couple were having a drink and the guy masturbated in a glass of water and the waiter unintentionally served this glass to another female passenger, she drank the glass and noticed it which turned her on so she went to the back of the car and f...d the waiter.
Thank you in anticipation and look forward to receiving some feedback!