Found this on isc.sans.org
Using some keywords with a Google search you can pretty quickly find some embarrassing content that may have been added to your site by a hacker.
A couple quick searches like this may come up with all sorts of stuff:
This is an example of searching University Sites for cialis or viagra. Look how many of them have been hacked. Click here to see it in action.
site:.edu (cialis OR viagra) buy
Here are some other examples given by ISC:
site:mygov.gov cialis buy