The pigs are being given nicknames for organization:
"Pig 1" is the pig on the left.
Pig 2 is the pig on the right
Pig 3 is the pig that falls on the plank.
Pig 4 is the pig on the ground.
Some Minion Pigs are on a platform. Pig 1 jumped but accidentally made the anvil move to the left. The pigs jump on the right side, but they tipped the plank too far to the right. The anvil falls into Pig 1's mouth and Pig 2 tries to pull it back up. Pig 1 fell even more to the right and Pig 2 jumped on the other side in panic. Then Pig 2 tried pulling Pig 1 up again and jumps (again.) Pig 1 and Pig 2 panicked and Pig 2 shouted upwards. Pig 3 fell on Pig 2, making the plank tip to the left, and making Pig 1 drop the anvil,causing Pig 3 to fall off the plank. The plank suddenly tips to the right, and Pig 2 bit Pig 1's tail until Pig 4 showed that the plank was not high up. Pig 1 and Pig 2 fell on the ground, sighing.