less than two hours before one of her mother 's famous cocktail parties ( that was how ' donna 's father always referred to them , with a satirical tone that automatically conferred the capital letters - the same satirical tone that could sometimes drive samantha into a frenzy ) , the disposal in the kitchen sink had somehow backed up into the bar sink , and when her mother turned the gadget on again in an effort to get rid of everything , green goo had exploded all over the ceiling .