Start of med school: Neurosurgery, Pediatrics, FP or OB
End MS3: Neurosurgery
I only was interested in neuro to start because of a fatal TBI in my family just before med school started. I tried during my 3rd year rotations to find something else, as my personality and love of life outside medicine were more in tune with Peds and FP. I gave it all an honest and complete look (except IM, no offense to those insanely intelligent people who can handle complex train wreck patients). But in the last rotation (FP), I realized I liked treating adults too much to give them up, even though the well baby checks were still the most fun overall. And I can't deal very well with chronic disease, day in and day out. And you can't do OB without having to do some Gyn. After weeks of tortured self-reflection, I realized I could not tear myself away from the brain, the spine, and the mysterious. It was hell, and I am still not 100% with my decision, but 99% was close enough for me.
The end of 3rd year seems the most exciting yet, as I feel about to blast off to the rest of my life. I offer a sincere good luck to the incomings. It is way better than studying for the ****ing boards.
Coincidentally, just as a recommendation to all incoming third years who may be worried about grades; if you give each rotation an genuine look, work hard and get excited about coming in every day, you will get honors. The only class I didn't was medicine. Was it because it is the hardest clerkship, or because I couldn't get my go up? Who knows...