The strangest law so far that I have come across has to be the law in France that allows somebody to marry a dead person. It was called Posthumous marriage. It came about during World War II, when some French women were married by proxy to soldiers that had died weeks before (marrying by proxy is where a person acts as someone else, and marries the other person on their behalf). this is legal under Article 171 of the civil code. it states " The President of the Republic may, for serious reasons, authorize the solemnization of marriage if one of the spouses died after completion of official formalities marking it unequivocal consent." Sourced from Wikipedia. It became legal for civilians in the 1950's, when a man engaged to a women called Irene Jodant was killed when a dam burst in Frejus, France, and killed 399 other people. Iréne Jodant pleaded with the French President Charles de Gaulle, to let her carry on her plans, to marry this man  André Capra, who had died. She somehow managed to get the support of the media and public. Within a few monthes of her pleading, her persistence and overwhelming support got her what she wanted, she married the man.
If somebody wants to do this, then they have to send a request to the President, who sends it to the Justice Minister, who send it to the prosecutor of the surviving members district.


in my opinion thus is by far the strangest of all the laws that I encountered.