The Mane 6 are having a party at Sugarcube Corner. After Pin the Tail on the Pony, Applejack suggests a game of biting tails, in which the ponies try to guess whose tail each pony will bite for Round 1, and each pony will guess who's biting her tail in Round 2. Who will be the victor?
Of course trust Applejack to turn it into a game, she's been biting tails since Episode 1, especially Rainbow Dash's tail, though she did take a 96-episode hiatus between Power Ponies (Episode 71) and Shadow Play Part 1 (Episode 168).