Most of us probably couldn't tell our friends apart just from their ears. But listen to this: scientists reckon our ears could be used to identify us in the future.
They say ears are the most recognisable parts of our body and that no two ears are ever the same.
They've been working on hi-tech equipment that can match ears to a person, in a similar way to how fingerprints are used.
Ricky's been to the University of Southampton to hear more about it...