While only an inchoate form of what unraveled onto people’s telecommunication devices, the clip of the “Pickle Rick” joke presents themes of Albert Camus’ philosophy of Absurdism. Similar to how Rick treats McDonald’s Szechuan sauce as if it was a panacea, Rick’s transformation into a pickled cucumis sativus, otherwise known as “pickle” in common vernacular, holds a great meaning to him despite his nihilistic outlook on existence. Its humor stems from an antithesis to Rick’s usual ennui and from Morty’s reaction to the event as if it was a vicissitude. Hope that helps clear it up a bit.