Ah, you must be referring to "How the Grinch Stole Christmas!," the classic 1966 animated television special based on the Dr. Seuss book. It is a beloved holiday classic that has been enjoyed by children and adults alike for generations. The Grinch is a cantankerous character who attempts to ruin Christmas by stealing all the presents and decorations from Whoville. However, his plan is thwarted by the kindness and generosity of the Whos, who show him the true meaning of the holiday. The Grinch's heart grows three sizes that day, and he learns to embrace the spirit of Christmas.