Sometimes, people seems to really want to be excluded from search engine result pages (SERP).

Jeremy Zawodny [1] complained [2] about SourceForge [3] : "You're blocking Yahoo! Search crawlers from your site and have been for several days now." He ask them to unblock the spiders, or to use the robots exclusion standard [4].

The funny part is that Yahoo.com dont provide a robots.txt [5].