Did you notice? Before the elves throw him in the cell, they find yet another dagger... and then, in the barrels, he still has one dagger. Always wondered where that one came from... maybe Fíli is the guy with the weapon in his trousers...
Kili is like: Don't touch my brother.
Thorin is like: Stupid Elfs.
Fili is ilke: Fuck.
And the elfs ar like: o.O