Krakrox the Barbarian is an Asymmetric Publications game that inspired many aspects of Kingdom of Loathing. For instance, both Cobb's Knob and the The Misspelled Cemetary were originally found in Krakrox.
Starting from June 2009, players in the Kingdom could relive Krakrox's adventures.
Seal Clubber logo and Seal-clubbing club
These images strongly resemble the "sturdy fallen branch" in Krakrox.
The bat hole bats in KoL are similar to the Krakrox bats, except with differing images for the head.
The image for the KoL Moxie weed is taken from the "heart-shaped fungus" of Krakrox.
The image for the Money-Making Goblin looks very similar to the knob goblins in Krakrox.