Oil Drum, as seen in Donkey Kong Country.
Oil Drums are cylindrical metal drums that are filled with oil and have the ability to create monsters from themselves. They appear throughout the Donkey Kong series as undefeatable obstacles.
Oil Drums would first appear in the Donkey Kong arcade game. They would appear at the beginning of the level and are quite harmless, unless a barrel lands inside of them. This will result in them producing Fire, which can harm Mario.
In Donkey Kong Country, the Oil Drums would have two attacks. They will either expel flames, or throw out enemies(commonly Slippas). In the level Oil Drum Alley, Donkey Kong and Diddy Kong will need to jump from one floating Oil Drum to the next, without being hit by the fire. The Oil Drums that release enemies, will have a skull and two bones painted on them. The ones that release fire, will just have the word "OIL" painted on them. There is also a boss named Dumb Drum.
They would reappear in the semi-sequel, Donkey Kong Land without any changes.
A tipped over Oil Drum can be seen in the background of Klubba's Kiosk.
Oil Drums would work the same as the ones in the original Donkey Kong video game. They only appear in the final battle of the game. When a barrel lands in the Oil Drum, it will create a fireball enemy.