Gambling Fever:
“The staff are finally paid out their long-expected bonuses. When Mr. Harman tells them he knows of a horse that absolutely cannot lose that afternoon’s race, they all bet their £100 bonus on the horse. They want to watch the race on the television in Mr. Rumbold’s office, but he catches them and throws them out. Mr. Harman tells them that they have lost their bonuses, but they can win them back by betting on another horse.”
Source:Wikipedia