I particularly like how, when scrolling on mobile, I'm suddenly sent down 10 posts because it had to load, making me have to scroll back up to find the post I was actually reading. I'm on Windows Phone though, so people tend not to care.
Also, before posting this I just randomly got kicked back to the list of posts, and when I pressed "back" I returned here, with the thing asking me if I wanted to discard the post. At least it saved my text. (happened again here, so I'm starting at syndromes post but I can still type. Can't see what, though, but words are happening as blakey said)