The effect was fascinating and frightening, as well as a little annoying. It didn’t happen all of the time but came and went without warning. However, it never extended past the near, almost immediate, future.
For example, on his birthday he had to feign surprise as he opened his gifts since as he unwrapped them he knew exactly what each one was before he had the packages fully opened. Just an hour earlier he was totally clueless as to what he would be receiving.
Over time as he grew older he learned to somewhat manage the phenomenon. But he never really got used to it. Most of the time he wished he didn’t know what was about to happen. He had no concept of what it was like to experience a real surprise.
The last thing he ever foresaw was how he would die. Then he did. What happened next he never saw coming; it was a complete surprise.