Starting to wonder why I tend to like our QA people so much: they often seem so much saner. Yes, sometimes they quibble as with the complaints about a page that is hidden from the user anyway, but they would usually not creep to deep into the hole creating most unintuitive workflows and abysmal logic.
Disclaimer: We're more like backend devs, but we had to do a UI which was beautifully slaughtered by the CEO messing with it - guess what's happening with the new one - and because of that... thing I already nearly smashed my Mac because stupid entered credentials for updating software would only be applied if you defocused once out of the password entry box. Fucked up stuff like this, which devs meddle with, give up, just shrug it off and dump it on the (l)user.

Or a more recent example: So PM wanted a stupid "Apply to all" buttons on a list that can be filtered. Guess to which items the actions should be applied if you filtered it and you currently only see a small selection in your window! Yes, of course it still applies to all items in the universe. QA guy who's just trying the buttons comes to me: "Hey, you sure this "apply all"-stuff supposed to work like that?"

Third example to end this long QA-praise: So there is this virtual appliance we build and we should support another stupid hypervisor.. and he found the kernel modules I have to activate additionally so we can just convert the existing image without having to create a new build system.