You're invited to the most whacked-out party of the year. Bring your togas, your appetite, and your attitude to the first-ever fraternity "zee-ba-cue" by the Da Brudderhood of Zeeba Zeeba Eata. A small cover charge is required, but zebras always get in free. Getting out is a different story. . .<P>In this, the fifth collection of the wildly popular <I>Pearls Before Swine</i> comic strip, Stephan Pastis's original creations Rat, Pig, Goat, and Zebra join the sophomoric cast of crocodilian cutthroats in Pastis's funniest work yet.