When you see this restaurant, your thoughts might turn to, of all people, baseball Hall of Famer Yogi Berra. He supposedly said, "Nobody goes there anymore; it's too crowded." He was talking about a New York club, but people have been saying it about this Harvard Square hangout for nearly 20 years. Patrons loiter at the bar for hours, enhancing the festival atmosphere. Many are waiting to be seated for generous portions of tasty (if not completely authentic) food. The menu features Tex-Mex, Cajun, and some Caribbean specialties, and the beleaguered staff keeps the chips and salsa coming. When you shout your order over the roar of the crowd, try the excellent chorizo appetizer, enchiladas (seafood is particularly delectable), any kind of tacos, or popcorn shrimp. Fajitas for one or two, sizzling noisily, are also a popular choice. Set aside a couple of hours, get yourself into a party mood, and ask to be seated downstairs if you want to be able to hear your companions.