The mob dismemberment mod for MineCraft is perhaps the most enjoyable mod to date. Not to be confused with the amputation mod, the dismemberment mod allows you to destroy your enemies. Now I should clarify, currently the mob dismemberment mod is only truly effective against creepers, zombies, skeletons, and zombie pigmen.
But by utilizing this mod your opponents limbs will be cast from their bodies upon death. As an added bonus a small shower of blood is emitted from your felled opponent as well. While their dismembered limbs do disappear rather quickly, the fun of annihilating your opponents is sure to give you hours of fun.