Birds do it. Bees do it. Folks who get down on their knees do it. President Bush did it at a state dinner in Japan in January, and Wayne and Garth leapt into pop culture's vanguard by threatening to do it all over the big screen. You know what we're talking about, so don't make us put it into words-although if we wanted to, we could use any one of the hundreds currently available. ''Hurling'' (that's what Wayne calls it). ''Spewing'' (that's what Garth calls it). ''Fainting'' (that's what the ever-delicate State Department calls it). Yep, we're talking about the yawn that spawns, and it's 1992's unlikeliest entertainment trend. Don't believe us? We suggest a visit to your local toy emporium, where the gotta-have new product is a two-piece squeeze toy (several of which are shown at right) melodiously titled the Blurp Ball. One pinch, and a shark coughs up a diver's head, a vampire expels a human heart, or a pig sends a rotten apple spinning into orbit. Look for it in-where else?-the gag section.


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