Rick-isites
Remember when those positive memories where implanted in the minds of the Smith clan in the Season 1 episode, “Total Rickall”? Well, Rick was the one who bought those telepathic parasites into the house. In “Mortynight Run,” Rick had green glowing geodes in his trunk. Busted, broh!
One of the said geodes had eggs from which the parasites were born. Additionally, you can see Rick throwing “glowing rocks” into the kitchen before painting the dining room a stunning shade of parasite. So, it was Rick all along! Those memories with Mr. Poopybutthole were never real!