Ah the fist bump: beloved of ageing hip hop fans, “cool” geography teachers and Barack Obama. And now, it appears, of Apple too.

The tech giant has filed a new patent for “gesture based information exchange between devices in proximity”, i.e. ways to transfer information to people during what Apple calls “greeting events”, such as the fist bump, handshake, hug or even bow.

The patent might not specifically mention it, but the drawings in the filing suggest that the company has the Apple Watch in mind with this new idea, which would make a lot of sense.

So when your child’s geography teacher tries on a new fangled greeting with you at the next parents evening, don’t be shy: he might just be after your data.