Final answer:
No contract exists between Miguel and John since there is no evidence of an agreement or consideration, which are essential elements for a contract to be legally enforceable.
Step-by-step explanation:
The question asks whether a contract exists between Miguel and John in the described scenario. A contract requires an agreement between parties that is intended to be enforceable by law. This includes an offer, acceptance, consideration, and mutual intent to be bound. In the scenario with Miguel and John, no conversation or exchange of terms is described. John picking up screwdrivers and waving at Miguel does not in itself constitute a binding contract as there is no evidence of mutual agreement or consideration involved. Therefore, based on the information provided, it does not appear that a legally enforceable contract exists between Miguel and John.