Dreams are weird

I woke up (or "woke up") briefly this morning around eight-thirty to what I thought was a conversation between my two roommates. (It later turned out that I was probably still dreaming, or at least imagining the entire conversation, hence the parenthetical quotes.) As I left my dreams, a phrase drifted to the forefront of my mind:

"Exactly three bananas and a sock."

Aside from being nonsensical by itself, it doesn't even make sense in context. There was nothing in my dream(s) or the imaginary conversation that had anything in particular to do with bananas or socks. Just - what? I don't even. What?

Why three bananas? Why exactly three bananas? If we're being exact about the bananas, why don't we number the socks as well? Why is it "a" sock and not "one" sock? And why the hell would I need or want that particular combination of items?

I would like some answers, but my brain is not providing :/ Any thoughts, internets?