In a web search for Ice-Chocolate (http://www.google.com/search?q=ice-chocolate&ie=UTF-8) there are three image direct image results, courtesy of a Google onebox on top of the other results. Clicking those will always result in the missing of the "remove frame" option to the top right, and sometimes – in Firefox – the alert "The URL is valid and cannot be loaded." Hmm.

[Thanks Dominik Mayer for pointing this out! http://www.dominikmayer.com]

The message appears because there's no imgrefurl:

http: //www.google.com/imgres?
imgurl=http: //lh3.google.com/_QIRBuuEIGRE/
RsRZ81WHUuI/AAAAAAAABdg/K5-b02zRpec/s800/CIMG2368.JPG
&imgrefurl=http ://&h=107&w=143&....