I've seen this happen randomly in the last few days when trying to use the basic search function. Put in your search term - one word in this last instance - click on the 'lil magnifying glass search icon and the search returns:
index vbalbum,vbalbumdelta,vbarticle,vbarticledelta,vbblogcomment,vbblogcommentdelta,vbblogentry,vbblogentrydelta,vbfaq,vbfaqdelta,vbforum,vbforumdelta,vbpicture,vbpicturecomment,vbpicturecommentdelta,vbpicturedelta,vbpost1,vbpost10,vbpost11,vbpost12,vbpost13,vbpost14,vbpost15,vbpost16,vbpost2,vbpost3,vbpost4,vbpost5,vbpost6,vbpost7,vbpost8,vbpost9,vbpostdelta,vbsocialgroup,vbsocialgroupdelta,vbsocialgroupmessage,vbsocialgroupmessagedelta,vbstaticpage,vbstaticpagedelta,vbthread1,vbthread10,vbthread11,vbthread12,vbthread13,vbthread14,vbthread15,vbthread16,vbthread2,vbthread3,vbthread4,vbthread5,vbthread6,vbthread7,vbthread8,vbthread9,vbthreaddelta,vbvisitormessage,vbvisitormessagedelta: syntax error, unexpected $end near ''
Wazzit mean?
This hasn't come up using the Advanced Search Option.
index vbalbum,vbalbumdelta,vbarticle,vbarticledelta,vbblogcomment,vbblogcommentdelta,vbblogentry,vbblogentrydelta,vbfaq,vbfaqdelta,vbforum,vbforumdelta,vbpicture,vbpicturecomment,vbpicturecommentdelta,vbpicturedelta,vbpost1,vbpost10,vbpost11,vbpost12,vbpost13,vbpost14,vbpost15,vbpost16,vbpost2,vbpost3,vbpost4,vbpost5,vbpost6,vbpost7,vbpost8,vbpost9,vbpostdelta,vbsocialgroup,vbsocialgroupdelta,vbsocialgroupmessage,vbsocialgroupmessagedelta,vbstaticpage,vbstaticpagedelta,vbthread1,vbthread10,vbthread11,vbthread12,vbthread13,vbthread14,vbthread15,vbthread16,vbthread2,vbthread3,vbthread4,vbthread5,vbthread6,vbthread7,vbthread8,vbthread9,vbthreaddelta,vbvisitormessage,vbvisitormessagedelta: syntax error, unexpected $end near ''
Wazzit mean?

This hasn't come up using the Advanced Search Option.