The Next Frontier in Advertising

Last week, it was ads on eggs. This week — well, the headline of the A.P. article pretty much says it all: “U.S. Airways to Place Ads on Barf Bags.” I am wondering what might be next. Any candidates? I’m thinking about newborn babies. Hospitals already ink up their feet for footprints; maybe after they do that, they could stamp a nice little ad, with indelible ink, for Pampers or a 529 college-savings plan?