Last modified: 2011-08-16 20:11:11 UTC
See [https://secure.wikimedia.org/wikipedia/en/wiki/Special:Contributions/Zalgo], [https://secure.wikimedia.org/wikipedia/en/w/index.php?title=User_talk:Zalgo&diff=prev&oldid=444674442], the text vertically obscures other revisions in histories and text in diffs.
Well, that's how those bajillions of combining characters render. Not sure what we could/should/would do to change it...?