Hosted by Justin Silver and Dan Dunn, “Revenge Fantasies” offers a revolving carousel of high-profile guests the chance to assuage lingering feelings of humiliation, anger, hurt and victimhood by virtually settling the score with the jerks who made them feel that way. Each episode features real stories, recounted as they actually happened, followed by spirited ruminations about imagined, “alternative” endings to those stories. Basically, wild riffs on what coulda’, woulda’, shoulda’ been done instead. “Revenge Fantasies” is the podcast where embitterment finally gets its due.