On February 1987, all NBC game shows did a special sweepstakes called "Car-Azy February". Each show had a special question or puzzle asked or shown to the home viewers. Correctly answering the questions and/or solving the puzzles won the right to be entered in a drawing for a brand new Isuzu.
Here's Bill reading a question for that contest. Notice the hexagon with the letters "VD" on the screen.