I love Christian's Inferno and (aside from the amazing evil laugh) the contrast between the verses and the chorus is the best part! It made me laugh out loud the first time I heard it, the way it surprises you with this catchy tuneful chorus after the totally different sounding snarly verses is great. And then it descends back down to the evilness with that laugh, perfect.
I like the countdown because of that too. It's fun. It's like a countdown to a "nuclear" bomb going off and the album/party starting so seems fitting.