Something I've been wondering about is...is it possible to have a favorite key or keys? (musically speaking)
Usually, what I do is when starting a new song, I always make my melody in A minor (or C Major if I am doing a major song, but rarely do I do Major) then change the key after, and most of the time, I like B or F minor the best. It just sounds best to me.
What's interesting is that Kesha's "Take It Off" is in F minor, and the Wonder Girls "The DJ Is Mine" is B minor, and those are some of my favorite songs.

I guess if you know a dance pop song in either key, chances are I will stan for it.