What did the left eye say to the right eye?

This clever little gag plays on a fantastic bit of wordplay, giving our ocular organs a voice and a secret to share. The setup immediately sets up the personification, inviting us to imagine eyes having a chat. The punchline, "Between us, something smells," masterfully deploys a double meaning. "Between us" usually implies a confidential whisper shared amongst two people. But here, it also literally refers to the physical space located *between* the left eye and the right eye – precisely where our nose, the organ responsible for smelling, resides.

The humor springs from this delightful anatomical accuracy combined with the absurdity of the eyes, which only see, commenting on a smell. Our nose is the unsung hero of olfaction, constantly working to detect the good, the bad, and the downright stinky. This joke gives a knowing nod to the nose's central position and function, all while packaging it in a quick, witty exchange that highlights the literal interpretation of a common idiom. It’s a perfect blend of anatomical smarts and linguistic trickery.