Back in the days of the Mattel Cabbage Patch Kid craze it was usually very hard to get one for the kiddies. A radio station (I don't know where) announced that Mattel was going to get Cabbage Patch Kids out to the people of this particular city. The plan was that they had to go to the football field of the local university and wait. An airplane would fly overhead and the dolls would be dropped onto the field. People were supposed to hold their credit cards up so that a photographer with a telephoto lens in the airplane could get the credit card numbers and charge the price of the dolls to the recipients' accounts.
People actually showed up, waving American Express cards in the breeze.
Another radio station prank took place on April Fool's Day. They announced that the phone company would be cleaning the dirt out of the phone lines that afternoon. They do this, it seems, by blowing air into the wires in the switching station. The problem is that the dirt comes out of the earpiece and mouthpiece of the telephone, and could dirty the rugs or furniture in your house. Consequently, the phone company asks that the good citizens please get plastic baggies and put them over the handsets of the telephones to protect their belongings.
Stores reported a run on plastic bags, and the phone company made the radio station retract the original claim.
I've always felt that the retraction should have been handled this way: "The phone company would like us to tell you that our earlier message concerning the blowing of dirt out of the phone lines was incorrect. The phone company does not, repeat NOT, blow into the telephone wires to clean out the dirt. Anybody with any understanding of the way the system operates would know that they suck the dirt out."
Alas, the retraction was serious and factual. What's this world coming to anyway?