There is one big se guy who sets my anti virus off everytime I hit his pages.
A search got me this url:
www.niigata-bandaijima.com/amateur.html
it redirects a couple of times to this url:
http://www.osee.net/1/enter.php?amateur
And all kinds of warnings are popping up.
The first URL probably won't redirect you unless you're coming from google or any of the other engines.
This guy is big. At least 100k SE surfers daily I would guess, probably alot more.