Some people spend a lot of time finding ways to block the freeloaders from their wireless internet. Others find fun ways to mess with them…. They start off by settup up dhcpd.conf to carve out two subnets a “good” one with known mac addresses and an untrusted…. then the fun begins with some proxy side image manipulation. Either upside down images, blurry images, etc. I wonder why you don’t just take it a step further…. block images entirely and replace with a jpg of your choice. IF you have a very BUSY accesspoint with freeloaders – maybe you could even sell an ad…. or do a captive portal for the untrusted crowd that redirects through a page that says…. “Uploading personal data…. Please wait…. Credit Card info transfered…. browsing history transfered….. email history transfered…. My Documents in progress…” Of course, it would be actually doing this…