If you are quick enough then you might just be able to witness a phenomenon never to happen again (or so we all Google fans hope)
Do any search on Google and you would see
"This site may harm your computer " warning!
I’ll update what the Google guys have to say on this soon.
Update 1: The goof up seems to have been corrected. I’m posting a screenshot I had taken when I encountered this problem.
Click the image to enlarge.
Update 2 : Google Says It’s Human Error caused by the StopBadWare.org team.
Update 3 : StopBadWare.org says its not their fault!