Don't cross the exit streams!
slush reports in http://archives.seul.org/or/talk/Jul-2008/msg00061.html
that when he makes 300 circuits in a quick amount of time, then refreshes his page, he gets a page with some content from a different stream in it. See e.g. http://www.slush.cz/centrumyahoo.png for an example.
Jens has independently reported this too.
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