Normal
Sam often wonders when precisely he had begun considering giant, talking, shape-shifting robots from another planet normal in his life.
The only reason he wonders is because he cannot pinpoint the exact moment it did, it is almost like it was never abnormal. He had surprised at their appearance, yes, but freaked out, no.
He always had been out of step with everyone else; destined, or so Optimus told him, to take up the mantle of a Prime. Is it possible that this had always been what he subconsciously, because despite all the talk of fate he never could have dreamed this up, accepted?
Was that why he fought so hard to be like other people, because he knew he never could be?
No matter what the answer, he did know, without a doubt, that he would not have wanted his life to have gone any other way.