To honor the world’s favorite grouch, Oscar, from “Sesame Street,” National Grouch Day was created on October 15. This is a day to celebrate all the grouches we know — or to embrace the grouch that lives inside all of us. On this day no one can stop us from complaining, being irritable, or wallowing in misery. Because that is what grouches do! Also, this day teaches us that it’s good to spend time processing our negative emotions. On social media this a fun day with people posting jokes, memes, funny photos, and stories.