Exhaust fumes, humidity and, on a bad day, road kill. These are the things I smell when I drive the highway with the windows down. Grilled steak, not so much. Travelers on Highway 150 in Mooresville, N.C., however, experienced the smell of grilled steak wafting through the air, thanks to a scent-emitting billboard.

Why go over budget with an ad campaign when you can defray costs by using nature's natural light as your ad medium? That's right: Let the sunshine in... to create outdoor ads promoting the use of sunscreen.

Gauging the amount of advertising a person can take often depends on the degree of exposure and whether the consumer receives an incentive in return. Personally, I'd rather arrive at a movie late to avoid sitting through a handful of ads prior to previews. But let's say I'm taking a short flight and I'm offered a free lunch or snack that comes in a sponsored-covered box. Show me the advertising!

Florida has oranges and key lime pie. Maryland has crab cakes. Idaho has potatoes. And Wisconsin has cheese. Get ready for imagery guaranteed to make your mouth water, unless you're lactose-intolerant.

How do you boost enrollment at a university in Brazil, a country that's home to more than 2,000 universities? Offer online enrollment through Facebook, of course.

How do you get consumers to flip for your housecleaning product? Start by persuading them to flip their Twitter posts.

Daffy's launched an unbranded outdoor campaign in subways last month that drove New Yorkers to Twitter for answers.

The Durham Arts Council holds a twice-yearly Art Walk in Durham, N.C. that showcases original art from local artists while supporting the city's downtown neighborhood. The nonprofit enlisted volunteers to create 50 pieces of "art" from donated materials to promote the April event.

Whoever said radio was a dead ad medium never had their phone dialed by a radio spot. Can a print ad make dinner reservations? I don't think so.

The Stride gum ostriches will find you, whether you're online or offline. In TV spots, these ostriches threaten anyone with bodily harm who dares reveal Stride's mega-mystery flavor. The animal with a face only its mother could love has also invaded the mobile realm, specifically the app world.