Here's another to file under "useful print advertising." Ogilvy Brazil came up with this magazine ad for Glacial beer that helps imbibers get their bottles cold in half the time. Readers just need to soak the ad in water, wrap it around a beer and stick it in the freezer to chill it in half the time it normally takes. Salt particle embedded in the ad's paper are what help to expedite the process. Cool idea, although it would be even more clever if it only worked on Glacial beer bottles.