I'm not sure if this has ever been implemented yet, but can you imagine a way of paying with Bitcoin by just using your own body?
It would be more of like a microchip implanted into your left or right hand that would contain both your public and private keys to send and receive Bitcoins.
So in case you want to send or receive some BTC, you would just pass your hand over at a scanner and it would perform the desired operation. This is would make it a very convenient and easy way to transact, and carry your Bitcoins with you anytime, anywhere. However, the only thing to be considered would be the security of your private key from within your implant, to protect your funds from theft.
Nevertheless, I want to know your opinion about this, since it would be pretty cool to have such a system to help spread mass adoption of the cryptocurrency.

I think that it is a good idea.
However there is really no need for this, all you need is a smartphone.
This would also mean that it is easier for hackers to gain the private key of the person using this implant. I simply do not think that this is a good idea, and when you see credit card hackers just walking by with a harmless machine but actually extracting your credit card details, you get chills down your spine.
If somehow security can be achieved, then this is viable. But it is also a permanent commitment to bitcoin for whoever wishing to get this implant done.