Normally, fooling around in the backseat of the car is a marathon. This is a sprint. From the moment you finish dictating your (and if you are a gentleman, your partner's) order to the static-garbled voice to when the surly cashier passes you the grease-soaked bag containing your food, get in as much heavy petting as possible. It's best to get as hot and heavy as you can, considering how many calories you'll be piling on once that processed food enters your body.