The United Kingdom's secret firewall
The UK has very strict laws about what you can and can't do with other people's data. If you intercept it so that you can see what it is, deliberately delay its transmission or prevent it from reaching its destination altogether, you can be fined or thrown in prison.
Unfortunately, that only applies if the data is written down and sent through the post. If it's electronic and you're an ISP, you can filter, delay and even block data all day long.
Our connections are already monitored and filtered to prevent us from stumbling across horrific and illegal images, but there's growing pressure for ISPs to do more. As we'll discover, ISPs could soon be stopping us viewing perfectly legitimate content, with secret blacklists making some sites disappear.