If you have all your thrown weapons except one and can't figure out what it is....
It's snake oil! I was playing the level 'The Mine' chapter 17 in the story and went backwards from where you start from, and came across an open jail cell with a skeleton in it.
If you go up to it it'll ask you if you want to talk.
Talk to it and it'll sell you a cantene filled with snake oil. It's effects are very similar to proffesor Perry's tonic.
A bubbling green substance that scorches your enemies.
Added by: Live_4iT Dec 19th 2005, ID#18722