A more thorough explanation:

Jamaican switch is an illegal scam where one person tricks another into believing they need help handling a large sum of money. The scammer may claim to have found the money or pretend to be an unsophisticated foreigner. They promise to share the money with the victim or ask for help finding a suitable charity to donate to.

Once the victim is convinced, another scammer appears and offers to help. They ask the victim and the first scammer to provide good-faith money. The intention is for both scammers to leave with all the money, including the victim's.

This scam is also known as the pigeon drop.

John was walking down the street when a man approached him. The man claimed to have found a bag of money and needed help deciding what to do with it. He promised to share the money with John if he helped him.

Another man appeared and said he was a lawyer who could help them. He suggested they both put up some money as a sign of good faith. John gave them his money, but the two scammers disappeared with all the money, including John's.

This example illustrates how the scammers use deception to gain the victim's trust and then take advantage of them by stealing their money.