Hahahaha... Alright, all joking aside:
[video=youtube;ve2zP98STjw]http://www.youtube.com/watch?v=ve2zP98STjw&feature=fvwrel[/video]
How about the Cold Steel Combat shovel? Get's the job done swiftly and six feet under, both in one tool. I get paid for posting this.
If this ain't what you looking for, I heard of a multipurpose killing tool devised in the mid 40th, compromising a handaxe into a small dagger. I forgot the name and the link though.
Wicked stuff, I tell ya.