Ice Age: A Mammoth Christmas (2011)

Eight years after the events of the third film, Christmas is coming and Scrat eyes a beaver assembling a cache of foods, among them an acorn. Scrat sneaks in and takes the acorn, along with others he finds in the area set up as decorations. He ties a large stockpile of them on a piece of bark and tries to leave with them, but they break out and roll away, leaving him with nothing.

Meanwhile, Manny brings the Christmas Rock out of storage, to Ellie’s delight: the rock is intended as a surprise for Peaches, who comes sliding down a snow slope in a snowball fight with Crash and Eddie. Manny reveals that the Christmas Rock is the same one from his childhood, a family heirloom, and important as it lets Santa Claus find them to deliver presents. Diego and Sid step in to see the Christmas Rock, with Sid deriding it. Manny refuses to let Sid near the rock and Sid, to find his own means of decorations, decides to find a different decoration and chooses a tree.