Are you having problems with your neighboors stealing your wireless? Well I'm sure most of us already know how to keep them off our wireless connection, but I found an article that instead of completely cutting people off, actually has some fun with them!
The idea is to allow others to get on your network and gain an IP address, but mess with their internet browsing. For example, no matter what URL they type in, you can redirect them to something like http://www.kittenwar.com/
The article even gives another option of using the Squid Proxy Server which allows you to flip the images, or blur them.
Read the article and enjoy the great ideas. The content is a little techy, but there are images and anyone will have a good laugh and get the general idea behind it.