GoogleWebmasterTools sees the wrong keywords? Rankings dropped?

I have a client website that has just plummeted in rankings and dropped to PR0.

For some odd reason in Webmaster Tools its top keywords are suddenly:

world
cup
soccer

.. etc

The entire website does not contain any of these keywords and never has! I have checked all pages individually and 100% sure the website is fine .....

Any idea what happened?

aha sorted!

Site was hacked and keywords stuffed into each page - confusion was because their webmaster restored the database without telling anyone .. probably a wee bit embarrassed.

ahh well, sorted