We all have something to hide? Not sure, but it's definitely that some want to go on certain websites anonymously. It usually happens when you want to write a review twice, or post more comments, from different IPs.
The safest way to do this is a VPN but that is not always easy or free to get one. A proxy server will also work but even if there are many free lists, it still requires a lot of work to find good working proxies.
Therefore the simpliest way is to start using a cgi proxy. Most of them are free and in a few seconds you can be anonymous.
Here is a list with free cgi proxies:
Just enter ony of them, and you'll be anonymous.