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#If you filter the User-Agent header with 'anonymize_headers' it
#may cause some Web servers to refuse your request. Use this to
#fake one up. For example:
#
#fake_user_agent Nutscrape/1.0 (CP/M; 8-bit)
#(credit to Paul Southworth pauls@etext.org for this one!)
So...you may be seeing someone with squid...
[squid-cache.org...]
Given the twisted sense of humor that makes sense. Specially if the hits pattern corresponds to a human visitor behavior and not to a spider.
(postscript: don't forget the konqueror and such users that can change the UA string from inside the browser! Maybe Opera lets you define your own, I don't remember right now)