Google, google, and more google. Apparently the minds behind the worlds greatest search engine have nothing better to do than come up with silly search pages. Maybe they should work on getting spam out of the SERP's...cough, cough.
Some are old, most you may have heard of, but if not check'em out:
Please give me more to list, this is all that I can come up with for now. As time permits I will be doing more searching.
More found here, at BorkBork google search.
http://www.google.com/intl/xx-bork/
Hey, it’s looking at google in a mirror.
http://elgoog.rb-hosting.de/index.cgi