If you've ever stepped inside a big park in the UK (Hyde Park, for example), you have probably encountered a swan. At which point someone around you will readily serve up the following fact: All swans are the property of the Queen, and killing one is an act of treason. Obscure? Yes. The Law Commission, the body responsible for pruning the statute book, will tell you that there indeed was a law regarding Queen's mute swan, which does state that killing it is unlawful, but certainly isn't (and never has been) an act of treason. There are a number of laws that are still technically in effect today that are, quite frankly, ridiculous. See if you can guess which.