When I was 23 and a little stressed over my lack of a five year plan, much less a life plan, I took a very long aptitude test in the hope that I was a few lego-blocks away from finding my life's calling. Administered over the course of three days, the test measures everything from your hand-eye coordination (average) and your sensitivity to tones (above average), to your memory (can't remember) and your reading comprehension skills (I thought that was the memory test). Aside from the fact that I am fairly certain I'm tone deaf, I think that the test was pretty accurate.
In the debrief/results meeting, the test administrator gives you a report that outlines the professional areas that you should avoid at all costs (accountant) and the ones that you should consider pursuing (small business owner). While I'm not sure what it was about my tonal-sensitivity superiority that led them to believe that I would be adept at running a small business, apparently I am adept at listening to positive feedback.

Perhaps 'small business owner' is just the default suggestion that they give when they can't come up with enough specific career paths, but something struck a cord. At 23, I may have been slightly lost, but I didn't need to take an aptitude test to tell me that I had a very healthy obsession with handbags, I just needed an aptitude test to tell me what to do with it.