I worked at a Mexican restaurant on upper Second Avenue for a while, one of those places on the frat-boy strip with the obligatory margarita sno-cone machine grinding away all night and vomit running ankle-deep in the gutters outside. The place was owned by a very aggressive rat population, fattened up and emboldened by the easily obtained stacks of avocados left to ripen outside the walk-in each night. They ran over our feet in the kitchen, hopped out of the garbage when you approached and, worst of all, stashed their leavings in the walls and ceilings. Every once in a while, the soggy, acoustic tile ceilings would crumble, and moist avalanches of avocado pits, chewed chicken bones and half-eaten potatoes would come tumbling out on our heads.