My son was shopping online the other day. He came across an ad, new king size mattress $4. He knows it's a misprint, but what the heck. He ordered 4, $16 plus tax and free ship to his door.
A few hours later he gets a phone call. Sorry for the misprint on the ad. We'll send you a $25 gift card for your troubles and pointing it out to us.
In yesterday's mail he gets the gift card. As they are getting in the car headed to work a Fedx truck delivers 4 king size mattresses. He'll keep them and see if the store wants them returned.