It is against the law in Singapore to feed monkeys (applies to children or adults behaving like one too).
A cook was recently fined S$4000 for feeding monkeys -> Click here and here. If you think S$4000 is too much, wait till you hear that the highest one can get for this offence is fined up to S$50,000 or jailed for up to six months or both. O_O
Feeding the monkeys will actually do them more harm than good. They will become dependent on humans and will lose their ability to look for food in the wild. Sometimes they become too bold and will resort to stealing food.
Find out more here.