Quote Originally Posted by ironwoman05 View Post
yeah that's handy

But is there a way to undo it?

It works well when you use it, but if you come back to the same thread later then hit "reply with quote" on a new post, you get all of the posts you quoted in your reply box (again)
You shouldn't, unless you're using the back button on the browser, which is telling the browser "return to the previous page in the state in which I left it" so if you're doing that, and getting the multiple replies quoted again, it's cause you should.