I'm not sure how many people read (or have even heard of for that matter) the website Cracked.com, but the authors there write some pretty hilarious articles. They ran this one article a few months back or so titled "7 Historical Figures Who Were Absurdly Hard To Kill." Not only did Rasputin take top place, but Trotsky was thrown in at number 4.
Here's a link to the article (WARNING! Explicit language....): http://www.cracked.com/article_16822_7-historical-figures-who-were-absurdly-hard-kill.html
And I feel the need to add some real merit to my post, so here is some information again on the death of Rasputin, in a much less interesting fashion: https://www.cs.tcd.ie/~peircen/xhtml/death_part_2.htm