Jurgen is not cool, he's the world's biggest dork, which is why he's hilarious! "Oooooooh, my live iz zo hahd! I'm immohtal and 'afe a cool castle wis a disco and secret lab and undead ahmy! Vhine, vhine, vhine, vhine!"
Also, why would Jurgen mention Sameth an Maximus to Sam and Max? "Hello complete strangers who 'afe come to deveat me! I knew your gross papas! Vell, time to become zombies!"