I tested (this time) as ISTJ. I recall that two of them, I came out as the other one depending on who I was when I tested. I think it was the S and the T that swap. So I'm always introverted and judge, but the rest is up to the chance of the moment...
ISFJ: The Martyr
If you are an ISFJ, you are giving, generous, and believe strongly in sacrificing yourself to serve your fellow man. Whether you're spending the entire weekend cooking souffle for your husband's big dinner with his boss or giving over your body as a vehicle for the Shoggoth from beneath the ancient city of the Old Ones so that the Great Gods can rise again, selflessness and service are your hallmarks.
This generosity of spirit makes ISFJs admirably suited for any career positions involving being tied to altars or ancient ritual daggers. ISFJs also do well in positions such as teacher, doctor, and crack whore.
RECREATION: ISFJs are of such a self-sacrificing nature that recreation does not come easily to them. Their leisure pursuits often express their inner natures; thus, they often amuse themselves and provide endless entertainment for those around them by being moody and passive-aggressive.
COMPATIBILITY: ISFJs do well in relationships with ENTJs, who take their self-sacrifice for granted and expect no less from their minions. They also do well with ESFPs, because...well, ESFPs will shag anyone.
Famous ISFJs include Thomas the Martyr, Tertullian the Martyr, and Theka the Martyr.
INTJ: The outside contractor
INTJs are solid, competent personalities who may seem aloof and even arrogant, but who are typically highly skilled in any field which interests them. INTJs are confident in their skills and knowledge, self-assured, and imaginitive; their exceptional problem-solving skills make them ideal architects, auto mechanics, and tools of the evil empire. While it requires the driving will to conquer of an ENTJ to imagine the Death Star and the evil genius of an ENTP to invent its devastating weapons systems, the skill and technical prowess of the INTJ is what makes the whole thing work.
The INTJ sees life as a problem to be solved. For that reason, the INTJ is the person a company brings in from the outside to streamline production processes and identify redundant assets for termination. The INTJ's combination of analyticial problem-solving skills and complete and utter disregard for the morality or consequences of his actions also make him ideal for the job of hatchet man, CIA operative, and helpdesk operator.
RECREATION: INTJs are often baffled by the strange and incomprehensible recreational rituals of other people, such as going to parties, watching television, and having sex. Instead, they prefer to spend their leisure time installing twin missile launchers in their cars to deter tailgaters and playing chess with megalomaniac CEOs of the Tyrell corporation.
COMPATIBILITY: Silly person, INTJs don't have relationships! They may, however build their own friends.
Famous INTJs include J. F. Sebastian and Sgt. Apone.
ISTJ: The Thought Police
ISTJs are characterized by loyalty, duty, and civic responsibility. As an ISTJ, you have a natural understanding of the value of civil harmony and order, and a deep-seated dislike of non-conformity, anarchy, and chaos.
For an ISTJ, work is very important to a sense of self-satisfaction. Happiness comes most easily for you when you have a job that allows you to express your ethic. Whether it's blasting traitorous rebel scum as a proud Imperial Stormtrooper or monitoring the population's cerebral implants searching for evidence of unauthorized thought patterns as one of the Thought Police, you're most satisfied when you are crushing the population beneath the iron boot heel of oppression on behalf of your masters.
RECREATION; ISTJs approach leisure with the same dedication they bring to spreading tyrrany and oppression. Common ISTJ pasttimes include cleaning their rifles, improving their marksmanship, betting on political dissidents in the Gladiator Arena, and macrame.
COMPATIBILITY: ISTJs are capable of stong emotional connections, bonding closely with the other ISTJs in their unit, platoon, or sector.
Famous ISTJs include TK-421, Torquemada, and Yuri Andropov.
INFJ: The Conspiracy Theorist
Beneath the calm, collected exterior of the INFJ lies the horrible reality of someone who has seen The Truth. The INFJ knows what other people are too naive or too brainwasted to admit: the Conspiracy is real. Mistrustful and suspicious, the INFJ is not easily fooled, and does not take the word of the government-controlled medico-military-industrial complex for anything. Whether it's uncovering the plot by butter-eating Jews to clog the arteries of Christian folk with artificial margarine or discovering the secret laboratory in Tibet that's producing legions of Jimmy Carter clones that will be sent out to seize the manufacturing facilities in the Guangdong Province of China under the pretext of inspecting chickens for influenza, there is no lengths the INFJ won't go to in order to blow the lid off the whole thing.
INFJs can often be found holding down jobs as AM radio talk-show hosts. They can also be found driving taxis in the greater Washington, DC area. Other common jobs often held by INFJs include vagrant, loony, whacko, and writer/director/producer of the television show "Seinfeld." INFJs can also be found feeding that crucial bit of information to determined FBI agents just before they are brutally murdered.
RECREATION: INFJs often come home from a hard day's work exposing conspiracies about how the government is poisoning us with mind-control agents spread by passenger airliners and unwind by spending all night writing Web sites exposing conspiracies about how NASA faked the Bush election.
COMPATIBILITY: INFJs are usually happiest and most successful in relationships with Julia Roberts, though the relationships may not end happily.
Famous INFJs include...well, if I told you, I'd have to kill you.