Yes and no.
I intend to major in philosophy and will have completed all the requirements by next spring. I dont want them to graduate me until i write a thesis (they automatically graduate you when you complete your major here at UW), so i'm waiting until i say i am done to declare my major. This might be a problem if i apply to grad schools, and in that case i'll declare after also declaring i'm going for bio-chemistry .
I heard of the same story happening at harvard.