I think that this actually isn't intended as humour but from time to time Google appears to believe that I (and many other people) am "a computer virus or spyware application". It puts up a page similar to the following [Title 403 forbidden]:
... but your query looks similar to automated requests from a computer virus or spyware application. To protect our users, we can't process your request right now.
We'll restore your access as quickly as possible, so try again soon. In the meantime, if you suspect that your computer or network has been infected, you might want to run a virus checker or spyware remover to make sure that your systems are free of viruses and other spurious software.
If you're continually receiving this error, you may be able to resolve the problem by deleting your Google cookie and revisiting Google. For browser-specific instructions, please consult your browser's online support center.
If your entire network is affected, more information is available in the Google Web Search Help Center.
We apologize for the inconvenience, and hope we'll see you again on Google.
Google does not appear to consider the possibility that there might be some kind of error or misunderstanding on their part. In most cases, the page comes back after a single Google search: how repetitive could that be? To be fair, this might be related to Google being confused by the existence of a proxy server or firewall.
Back to Humour here.