Why is using a HTTP GET to update state on the server in a RESTful call incorrect?

Question

OK, I know already all the reasons on paper why I should not use a HTTP GET when making a RESTful call to update the state of something on

Answer 1

If some form of search engine spiders your site it could change your data unintentionally.

This happened in the past with Google's Desktop Search that caused people to lose data because people had implemented delete operations as GETs.