[benihana]

I think most of those gifs are hosted on github. I tried to post a linked image, and it only showed the hyperlink. When I uploaded the image to github, it showed up inline.

[jmhobbs]

Github proxies the images in comments: https://github.com/blog/743-sidejack-prevention-phase-3-ssl-...

Here's the code behind it: https://github.com/atmos/camo