I didn't assume the story was true. I just found the response funny. Anyway, here's the link:
http://www.reddit.com/r/AskReddit/comments/1jjpxp/
Which (until this thread) was the only Google result for "head goes back into the toilet."
http://www.reddit.com/r/AskReddit/comments/1jjpxp/
Which (until this thread) was the only Google result for "head goes back into the toilet."