Hmm, is there some sort of a web service that serves up spoilers? We could add a CAPTCHA to ManaByte's account that makes him type in spoilers before he posts.
"ROSEBUD WAS ACTUALLY A: [SLED]"
"IN THE SIXTH SENSE, BRUCE WILLIS WAS: [DEAD]"
Perhaps, through repetition, he will learn what other people consider a spoiler.