Originally Posted by Critterpace

Sonic (a fast food place) is doing a similar promotion here in the Kansas City area. One of the couriers that delivers to our office has a drink cup attached to his trunk. He has been stopped several times by police who wanted to let him know that he "forgot" his drink. Other drivers have followed him to deliveries to let him know. Man are they upset when they find out it is just a promotion. Often times, unfriendly gestures follow.

I believe marketers call this type of advertising "guerrilla marketing."