Ogre slaying knife is a tribute to a playstation 2 game called "The summoner", which IMO is the greatest ps2 rpg made, despite it was made in the first year of PS2's release.
If you press like x or something during the intro or menu or whatnot, you'll be taken to a cinematic with some of the characters (including a guard from red faction, as both games are made from volition) all playing a game of table top D&D. Eventually after some arguing and whatnot over a mordenkainen spell, one of the characters, a giant monster, asks where the cheetos and mountain dew is (ahh yes I have many memories of doing this as well
DM replies "You're not there, your getting drunk!"
monster replies "Ok, but if theres any girls there, I wanna do them!"
And there ya go
The actual cinematic can also be seen on Ifilms.com Just do a search in there for summoner or summoner geeks or something like that.