McDonald's latest promotional campaign launches tomorrow: for the next two weeks staff will accept "Lovin'" as payment. Customers who order items during pre-selected times will be asked to pay with nothing but affection, which can be expressed in a number of ways. Some customers may choose to ring their mothers, share loved-up selfies, some may hug a stranger, others could offer the humble fist-bump by way of payment. They are set to launch the promotion using an ad during the Superbowl which costs $4.5 million for 30 seconds.