The simple act of donating blood could actually help save someone's life one day. And to help drive that point home, ad agencies Publicis Sao Paulo and Fundação Pró-Sangue in Brazil created a poster with a built-in charging cable that also helps save a dying smartphone.

The blood-red charging cable cleverly looks like it's actually coming from the arm of someone who's donating blood. But in this case the life-giving material is electricity, and it's being used to save a phone, not another human being. But the advertisement still manages to drive the point home that if you're able to give blood, you certainly should. [YouTube via Taxi via Creative Criminals]