I know what you're thinking--

that this was accompanied by some revolutionary new use for mayonnaise,

or a collection of recipes,

or proof that the stuff has been proven to cure diabetes.

Nope.

Just a coupon to buy some mayonnaise.

Here's the "Bright Idea" part of the ad -- I hope you're paying attention, 'cause it's a great new idea--

Put Mayonnaise On Your Sandwich.