A lot of people believe that illegal substances should be legal, however I'm more interested and intrigued by laws that don't even need to be legal.
My favourites are: In Britain it is illegal to to handle a salmon under suspicious circumstances, In Britain it is illegal to import potatoes if there is reason to believe that the potatoes are Polish and finally in Britain it is illegal to place a postage stamp bearing the queens head upside down on an envelope.
What illegal laws that don't need to be illegal would you make legal?
At least some of those are urban myths...
Being illegal to die in the Houses of Parliament.