Don't Forget To Carry Your Passport
If you're a foreigner, you should carry your passport all the time. According to the authorities, police can stop you anytime to ask for your identification! And if you don't have a passport then and there, you'll be arrested!

The Illegal Medicines
Some medicines that are allowed in the US are banned in Japan. For instance, any product that contains a stimulant ( pseudoephedrine) is illegal in the country so this includes inhalers as well as sinus and allergy medications such as Sudafed. So, if you're travelling to Japan, be sure to carry a prescription along with the medicines that can explain the need for these medicines!

Smoking Rules
While smoking is allowed in some restaurants, you cannot smoke out in open!

Drinking Rules
Surprisingly, drinking in public is legal in Japan, though it is frowned upon, but, it is legal by the law!

Fine For Being Irresponsible
You can be fined if you don't report an explosive to the police. And the fine is now increased up to ¥10,000.

Re-Marriage For Woman
A woman must wait 6 months after a divorce before getting married again. And if a child is born during these six months, it will be legally your ex-husband's baby.

The Child of A Foreign Mother
If a child is born to a foreigner mother out of the wedlock, the father must "recognize" the baby while it is in the womb for him/her to be a Chinese citizen. Otherwise, the father has to ‘recognise’ the child before he or she reaches the age of 20.

The Marriage Rules
Marriage will be invalidated if it turns out that you've married the wrong person. While it is a pretty-much outdated rule as it was framed when there was an arranged-marriage setup, we are curious to know how it works out today!

Brewing The Alcohol
You can't brew alcohol stronger than 1% at home.

Election Campaign Reimbursement
The people who are involved in campaigning for an election can be reimbursed up to ¥12,000 for hotel stays, ¥3,000 for food and ¥500 for snacks per day.

Dying in a duel
If you die in a duel, the national insurance companies that may have the person's term insurance, life insurance or health insurance won’t pay out to your next of kin. Fair enough?

Handling a Fegu
Fegu, also known as pufferfish is extremely poisonous as it contains tetrodotoxin, a substance that makes them foul tasting and often lethal. Hence, you need to obtain a licence or certificate before being able to handle fugu

Throwing Away Money
It is illegal to damage or throw the money. If you're caught in action, you might be heavily fined or jailed for it!

Discovering About Life Beyond Earth
If you discover life in outer space, including the moon, that may be hazardous to public health, you are required to immediately report it to the Secretary-General of the United Nations, as well as to the international scientific community.