I'm sure you've all heard the axiom "the definition of insanity is doing the same thing over and over again and expecting different results." Setting aside the utter ridiculousness of that statement in general, in genealogy you often do the same thing over and over and get different results. I, for example, have a series of names I run through various search engines every couple of months and today one has borne fruit.
Ancestry.com spat out a Gaol Entrance record for John Phillip Gail, for this incident that I have mentioned before. I now have a country of birth, Germany and an arrival year, 1829 and a ship, the Medway. If only he was actually named on the passenger list.