You hide the unreasonable bit in the last paragraph. Just like a tabloid. They start a story with the sensational totally unsubstantiated headline then bury the details truth in the last paragraph which people rarely bother to read.
I see this in the responses to posts on here, if they have several paragraphs, people respond to the beginning of the post, focusing on a detail there, or asking a question that is answered later in the first post.
So I would start my aibu by saying I hate how my mil eats babies then a load of waffle padding out the post, then reveal that she eats jelly babies in the last sentence for a unanimous yanbu? Though by my logic none of you will be reading this by now, blah blah blah, fruit shoots blah blah blah penis beaker.