Don't you hate it when stuff just works? It's predictable and boring, and if you ask me, anything falling into this category should be sabotaged immediately to spice things up a little.
Many web coders clearly share my view because this is precisely what they've been doing with their previously accurate, efficient and dependable search engines.
Take Googles' Image Search for example. Imagine your typical day; you're surfing the web when a sudden impulse to track down a picture of Spiderman wrestling a T-Rex grips you with full force. You visit Google Image Search and type in the keywords 'spiderman', 'wrestles' and 'trex'.
Now you wouldn't imagine there would be all that many depictions of such a scene so it would be reasonable to expect a return of say less than half a dozen hits at the most. Well you'd be wrong; supposedly Google currently indexes 1030 images of the web-shooting wonder getting down and dirty with the "last and largest known carnosaur".
It's curious that amongst these 'hits' are images of King Kong, random politicians, The Simpsons, Bambi, fish corpses and Wacko Jacko's face embedded in a slice of toast, but none of them remotely resemble what I actually searched for.

The fact that there are lots of pictures containing isolated wrestlers, spidermen and dinosaurs might indicate that Google has applied the OR Boolean search operator to my query rather than the more useful AND one. This isn't the case, however; if you click on the 'Advanced Image Search' link you'll see that the keywords are automatically entered into the "find results related to all of the words" box to demonstrate which kind of search I performed prior to reaching this page. Just to confirm, clicking the search button again at this point returns exactly the same set of irrelevant flotsam.
It could be that I'll never ascertain for certain if Spider-Man (yes, I know that's the correct way to write it) ever unleashed the Pumphandle Michinoku driver II on a 43 foot long, 7.5 tonne 'tyrant lizard king'. It's no laughing matter.
That's just a drop in the ocean. All kinds of search engines across the board are falling prey to Boolean vandalism; software repositories, forums, recipe databases - the list is endless. The digg coders are prime suspects. Try probing it for stories involving two of the widest prevailing bedfellows, the 'llama' and 'blamange'. Go on, guess how many hits there are for this keyword combo. 89! That's eighty-nine, EIGHTY-NINE!
It appears that contrary to the norm, you can crowbar the AND operator in between them to narrow down the field, but why wouldn't this be the default setting to begin with as it is with Google? (well, the text search element of Google anyway). You wouldn't dial 999 to report a crime and when asked, "which service do you require" reply police... OR a florist please, either will do. So why would it make sense in any other context?