You couldn't squeeze an orange. Let's have a simple case study on contract law. Offer and acceptance between a willing seller and willing buyer, with a little consideration to make things legally tight.

Bob: Hey, Alice I wanna buy your buns. (offer)

Alice: Sure, 1 BTC. (consideration)

Bob: Are you sure? (terms)

Alice: Yes. Let's sign a contract. (acceptance and signed terms, aka contract)

Bob: OK, Alice. Deal. Here is your 1 BTC. Let me play with your buns. (consideration passed)

Alice: Thanks, Bob. (done, deal. watertight).

Alice & Bob. Happy  

Hey, where's Fernando when you need him?