Google greeted me with this message while being behind a private proxy:
Our systems have detected unusual traffic from your computer network. This page checks to see if it's really you sending the requests, and not a robot.
I did my research and is seems that this is caused by automated searching, which I am not doing. I guessed that someone was doing automated search with the proxy I have (private proxy ehhh?). Now comes the part I don't understand and it differs from other questions: This only happens while using Safari and does not when using Chrome. Why is that? Did the automated searcher used Safari's User-Agent? I thought that google bans everyone using the same IP as the bot, which is unpleasant when using mobile bandwidth.