Mitchell & Webb did this even quicker with "A Man who has a Cough and it's just a Cough and he's Fine": > A woman, called Kylie, repeatedly exits a train, as a man greets her, who has a cough. The cough gets worse, until one time Kylie leaves the train to find no-one there. She believes he has died of TB, but he walks up behind her, stating "No, it was just a cough."