Stunning! Crazy Laws You Didn't Know Existed... Until Now! One cannot leave his house without wearing an underwear, in Thailand. In South Korea, traffic police have to report all the bribes that they collect from motorists. It is illegal for homosexuals to stay in Singapore. In Cambodia, it is illegal to use water guns during New Year celebrations. In Hong Kong, if a husband commits adultery, a wife can kill him, but solely with bare hands. In Japan, if one's girlfriend is proposed for marriage by his elder brother, she must agree.