I haven't seen any up-side-down.
But I've seen a couple in Spanish, Russian, and German.
For the Spanish and German, it doesn't matter if you use "a" for "ф", or "с" or anything else like that. So I don't know why they would use it? But for the Russian, how am I to do that? I happens to me a lot when I try to upload on Tinypic. But oh well.