National Grouch Day is celebrated on October 15 each year. This lighthearted observance encourages people to embrace their inner grouch and recognize that it's okay to feel grumpy sometimes. The day is often associated with the character Oscar the Grouch from the beloved children's television show Sesame Street, who is known for his cantankerous personality and love of trash. On National Grouch Day, individuals are invited to express their frustrations and share their grouchy moments with friends and family. It serves as a reminder that everyone has off days, and it's important to acknowledge and accept those feelings without judgment.