Hell, the job you planned on going into may not even be where you wind up.
A couple months after returning to school in '02, I had planned on going into education (spec. math), but my trepidation of dealing with teenagers (esp. with the memories of teenagedness fresh in my mind) made me focus on teaching exclusively in college, which would require a math graduate degree. Well, I enjoyed teaching college for the time I did it, but graduate math studies suck a huge fat one, so I toiled around for awhile before finding (lucking?) my way into my current job as an auditor