September 18, 2012
Borderlands 2 features a four-armed monster called Donkey Mong, which is clearly based on Donkey Kong. It has barrels on its back and throws them at the player as an attack, and also seem to be wearing a red tie, kind of like the original Donkey Kong.
Aditionally, if the player successfully defeats a Donkey Mong, they are awarded with the achievement "Definitely An Italian Plumber", a reference to Mario.
The creators of Boderland held no right over Nintendo's Donkey Kong, but they only included a mnor reference to the character.