Was chatting with some youth groupers this evening when one of them started typing in text that was upside down. When we asked how did he it, he linked us to this page.
I tried fooling around with the app a little, and decided to confuse the youth groupers even more by only flipping every other [...]

If you have a static Flickr URL and want to find the original Flickr page it was posted to, here’s how to do it.
First, here’s what a static URL looks like:
http://farm4.static.flickr.com/3632/3811569661_f801d1837f.jpg
Notice how the filename is two identifying strings concatenated with an underscore.
http://farm4.static.flickr.com/3632/3811569661_f801d1837f.jpg
Take the first part of this, filename, or
http://farm4.static.flickr.com/3632/3811569661_f801d1837f.jpg
and append it to this URL:
http://flickr.com/photo.gne?id=
The final [...]