It Goes Without Saying

"It goes without saying" is a pretty silly phrase. If something goes without saying, then you don't need to announce it. It's like, this is a phrase that exists, but should never be uttered. 

On a similar note, I always find it amusing when somebody says "our next speaker needs no introduction", and then proceeds to spend five minutes introducing the next speaker. Again, if something isn't necessary, then don't do it.