James while John had had had had had had had had had had had a better effect on the teacher

No, that's not a typo.  I randomly came across this article in Wikipedia.  Apparently it is used by teachers to demonstrate punctuation and the ambiguity of the word "had".  The sentence really does go as follows: James while John had had had had had had had had had had had a better effect on the teacher. To make sense of this, you can add the correct puctuation, below:

James, while John had had "had", had had "had had"; "had had" had had a better effect on the teacher.

Now it's all clear, huh?