Another great response to someone I would say is a couple of sandwiches shy of a full picnic basket. Wait a minute, I have always been told that the quote is 'Assuming makes an a$$ out of you and me." That is what I was told during my early days in the  Navy. Of course I was also told that there was the right way, the wrong way and the Navy way. Guess which way they wanted us to do and you only get one guess. A hint: it was not the right way.