The BBC has a list of most ludicrous laws some of them are really excellent! Here are my favourites:
It is illegal to die in the Houses of Parliament
In the UK it is illegal not to tell the tax man anything you do not want him to know, but legal not to tell him information you do not mind him knowing
It is legal to murder a Scotsman within the ancient city walls of York, but only if he is carrying a bow and arrow
In Switzerland, a man may not relieve himself standing up after 10pm
In Milan, it is a legal requirement to smile at all times, except during funerals or hospital visits
In France, it is illegal to name a pig Napoleon
Check out the whole list here.