Quote Originally Posted by Deadly View Post
I think that's basically my point, yes. Except perhaps the last part.

I don't think curses or at least curse-like effects need to be impossible, if you're a unicorn. Seems obvious that Twilight could do a lot of things that would seem like a curse to the recipient.

I think when the ponies talk about curses, they're talking about magical-like effects with a non-magical origin, and that's what Twilight is or should be objecting to. If she's objecting to the effects themselves being impossible, then she's just plain wrong.
And I'm fully willing to think she's just plain wrong.