Who's your favourite antagonist?

Or villain, if you will. So, out of movies, books, comics, video games, whatever other form of entertainment you enjoy, who’s your all time favourite bad guy?

Here’s mine.

The Shape, the Boogeyman, whatever you call him, sealed is your fate, should you happen to encounter him, he who reaps the lives of men
Black are his eyes, shining is his blade, hear their cries, those who died, a horrible price to be paid
For asking anyone there? or for going hello? you stepped into the Devil’s lair, hi there, nice halo
He moves so silently, stalks so dreadfully, strikes so violently, even should you live to tell the tale, you’ve gone completely bonkity and off your rail!
His theme song shall haunt you, or make you dance like a foo if it’s some techno remix, but anyhoo
He slashes throats and carves off chunks, your story ends with a bloody croak and your life has sunk
Into the wake of massacre he leaves behind, your gutted husk for the next fool to find!
Although some fight and victorious they stand, he shall return, for damnation does not die like a normal man!
From the seventies to the eighties right into your nightmares, watch your head mateys, for Michael Myers can never die, and uh…he’ll chase you up the stairs.

Wow that was lame. But Michael Myers is totally my favourite bad guy ever, so I had to write a poem about him. I was going to say a bunch of stuff about why I love him so much. Like how he moves so robot like, unlike many other slashers who show too much emotion in their physical demeanor…but Mikey HAS no emotion. And the few times his humanity attempts to resurface through his famous head tilt, you feel totally hopeless when he raises his knife again and starts going for you…he scared the crap out of me when I was 12, when I watched Halloween II. Except I think I’ve given these details here so many times already lol.

So, your turn. Who’s your favourite bad guy ever? And why? (I could have sworn this was asked here before though…but eh, times change, right?) Also, what kind of bad guys do you like the best? Really evil badguys, misunderstood villains, or delusional antagonists? (and whatever else there is)