This really raises a cautionary flag regarding deep linking (which is essentially what this entire thread is). And it goes beyond the fact that the server that a URL points to controls what is behind any specific URL. There are other concerns as well: Specifically, while I enjoy seeing these LOLcats posted here, we're really "supposed" to go there to see them. The folks who are ostensibly paying to host those images (among other things) are reasonably expecting to gain whatever advantages that they planned on gaining from offering that service, and effectivelly their reasonable efforts are being thwarted by this deep linking to the images on their server. If you read the Terms of Use for the website where most of the pictures posted in this thread are hosted, what we're doing here is pretty-much a violation of those conditions.
I'm not going to stop viewing this thread, and I doubt that folks are going to stop posting to this thread, but it is important to remember that what we're doing here it technically not what we're supposed to be doing...