You've probably seen this, but there's a sentence used to demonstrate the necessity of punctuation:

james while john had had had had had had had had had had a better effect

[url=It becomes: James, while John had had "had", had "had had"; "had had" had had a better effect. Technically acceptable, but I submit you're allowed to punch anyone right in the squishy bits if they make that sort of sentence with malice aforethought.][/url]