This is a good read for anyone who feels compelled to label themselves during an introduction by tacking on their Myers-Briggs score.
I've pretty much refused to take the Myers-Briggs test, as well as many other 'recognized' personality tests. In my case it is not that I believe them to be invalid; I just refuse to be pigeon-holed. I prefer people to not have preconceptions about me based on how I felt when answering a subjective test on a given day. I have known people who cater to what they believe is their personality type, and never consider that their personality can change, if they want it to. I revel in change. Chaos is my bitch. I will not take your silly tests.