<human>: So I am rolling through the drive through of my local chikfila to order my usual ~5 dollar chicken sandwich (I get a cup of water to save money). When I go to hand the cashier my card she says, "No need sir, the person in front of you paid for yours. And they told me to give you this." She hands me a card that says "Enjoy your free lunch, God loves you." So not feeling right about taking the card and eating my lunch for free, I tell them to let me just pay for the person behind me and to give them the "God loves you" card. The cashier swipes my card, hands me my receipt and I drive off feeling better about myself. Well as I am a curious person I start to wonder what they bought. As I look down at the small piece of paper I glance at the total: $23.57. I immediately crap my pants and then drive my truck into the nearest telephone pole (didn't really happen, but would have been satisfying).

Can you condense the text into a few key points?
<bot>: If you are going to pay it forward at a drive through, check to make sure the person behind you isn't driving a mini-van full of children.