How to Play Gimme That!

About Gimme That!, from BoardGameGeek:

In this potato-themed party game, you win by being the first player to write the number 100 while counting potatoes on the sheet in front of you. The catch: there's only one pencil for the entire group to use when tallying up their taters. The game starts with one person writing while the rest of the circle takes turns rolling the die. Most of the options rolled cause you to give everyone else a goofy gesture (a "high-fry" all-in hand slap, a "mashed potatoes" table drum roll, or a "spud-bump" simultaneous fist pound). But one of the die rolls will cause everyone to pass their potato-counting papers to the left, making the pencil-marker start where their neighbor left off, and giving someone else a big head start. And one of the die rolls will cause the roller to reach for the pencil and exclaim, "Gimme That!"