November 26, 2010 > Now in stores: whoopie cushion greeting cards Now in stores: whoopie cushion greeting cards AP Wire Service CLEVELAND (AP), Nov 12 - Now in greeting card aisles, a new product for pranksters: cards that double as whoopie cushions. American Greetings Corp. on Friday unveiled the line of cards that can make embarrassing sounds, aptly named ``It's a gas!'' The Cleveland-based company says each whoopee cushion-turned-card in the collection can be signed and sent in an accompanying envelope. The nation's largest publicly traded greeting card company has about 2,000 employees in northeast Ohio.