The thinline between a joke and a lie...

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Our company is sponsoring a charitable institution wherein all regular employees must give a mandatory donation of P200. There was my co-worker, a casual employee like me me doesn't seem to want to spend a single cent from his savings. It has been a usual thing for us to joke about his being "tight-fisted". The memo say that for casual employees ANY AMOUNT will do. My other co-worker who was one of his closest friend played a joke by telling him that he must pay P200 as contribution. Innocently the poor guy went on the long queue in the automated teller machine near our office to withdraw the amount of P200. When he gave it to our co-worker, she instantly broke it and told him it was a joke. He was so embarrassed that he didn't take his money back. He is in fact mad about what happened. The other friend didn't expect him to react that way since it's been years that they are together at work. What do you think about this situation? When do we stop or how do we know we cannot throw jokes easily even though we have done it for times already?