Holding Grudges - Batman: Arkham City (2011)

Soon after his arrival in Gotham City, the Penguin decided to make an impression on the underworld elite with a gala opening for his nightclub, the Iceberg Lounge. He included the notorious Joker, whose appearance would surely impress the crowd.

When the Joker arrived, Harley Quinn on his arm and a dainty flower in his lapel, the Penguin was thrilled. He was hosting the sinister soiree of the century-until a clumsy waitress spilt a drink on the Joker.

The laughing Joker aimed his flower and an acid spray melted the girl's face. As alarmed patrons fled the scene, a cold, dark rage at the Joker curled inside Penguin.

The Joker eagerly returned to the Iceberg Lounge a few weeks later but was insulted to find his name was not on the guest list. Willing to overlook this obvious mistake, he shot the doorman on his way in, kicked his feet up at a table, and ordered a glass of warm milk.

He was pleased when alongside the milk was a summons to the club's VIP section.

Led to a back room—past a tank where Tiny the Shark circled—the Joker happily greeted the Penguin, who promptly pushed him out of a door onto the street. The Penguin squawked out that the club had a new "no clowns" policy before slamming the door.

After arriving at Arkham City, the Joker and Harley Quinn were eager to explore their new stomping ground.

Reflecting that years had passed since the Penguin banned Joker from the club, they sought out the blue neon lights of the Iceberg Lounge. Harley pounded on the door, certain that Cobblepot would let bygones be bygones.

The Penguin answered, a hulking guard at his side, and immediately reminded them of his "no clowns” policy. He just managed to close the door before the acid from Joker's flower shot out at his face.