| The way one of our Admissions Officers described it basically like this (paraphrasing): We do look at what tentative major you've selected, so for certain majors, it definitely does pique our interest. So with Classics, for instance, we don't have that many Classicists, so if that's something you've indicated that you're interested in, we'll take notice. At the same time, by selecting that, we're going to scrutinize your application for evidence that you're actually interested in Classics. So marking a less-popular major won't confer any kind of advantage unless you have the background that proves your interest to that subject.
I should also clarify that there's really no such thing as "filling" a major. The classes are offered regardless, there's no quotas or cutoffs for majors in a particular field. If you're looking for a listing of some of the ones with fewer people in them, the ones that come to mind right away would be:
Theater and American Musical Culture (they're both brand-new)
Physics, Math, Chemistry, and Computer Science
Classics
Medieval Studies
Art History
Portuguese
Comparative Literature
International History
This isn't to say that those programs aren't strong - I know the Classics and IHIST programs are quite good, for instance. There just tends to be less interest in them, for various reasons. | 
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