There could be tons of choices from Metallica: Master of Puppets, Battery, Sanitarium, Blackened, Moth into flame, Unforgiven, Wherever I may roam and so on and so on. The band is THE definition of cool intros.
I like you sir. A lot. I'll add Hell Patrol from the same album, it's insane.
My Bloody Valentine - Only Shallow
MF DOOM - Doomsday
Michael Jackson - Baby Be Mine
Prince - I Would Die 4 U
Bjork- Army of Me (though maybe this is cheating for using the When the Levee Breaks drum break?)
Flying Lotus - Massage Situation
The Time - Wild and Loose