Bloody Mess

Bloody Mess is a Fallout, Fallout 2 and Fallout Tactics trait, as well as a Fallout 3 and Fallout: New Vegas perk.

Fallout, Fallout 2 and Fallout Tactics
This trait does not alter gameplay other than the fact that you get to see the violent death animations more often. However, it does have an effect on the ending of Fallout.

Bloody Mess has a positive impact if you plan to use the Super Sledge, or related heavy melee weapons. If someone dies, the death is instant instead of first sliding down half of the game screen.

Fallout 3 and Fallout: New Vegas
As traits were completely removed from Fallout 3, Bloody Mess was changed into a perk.