In Hong Kong, a betrayed wife is legally allowed to kill her adulterous husband, but may only do so with her bare hands. (The husband's lover, on the other hand, may be killed in any manner desired.)
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In Australia, it is illegal to walk on the right-hand side of a footpath.
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Oral sex was illegal in 18 states under old sodomy law until 2003 when they were invalidated.
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In Japan, gambling is illegal. However, they circumvent the law by giving out prizes instead of cash, which the winner can then sell back to the establishment for cash.
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There’s a law in Canada called the “Apology Act” which prevents parties from using an apology as a statement of fault in court.
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