Mine has to be Jagar Tharn, you can't beat the original :)

The Mudcrab :)

The Deadra Seducer ;)

Cliff Racers! I am solely responsible for the extinction of their species.

You beat me to it! lol

anyone who took an arrow to the knee, "die now for you should have died then"

I was thinking more bosses, damn I forgot everyone's favourite fast-breeding annoying bird things :p

The Kwama forager

I mean, when you fight it at first it just seems like some stupid worm that you pay no attention to, only then, later you discover that these creatures have a lot of interesting facts about them and having a whole subsystem of how they work and stuff...

Zombie in TES4.
Exploring a dark dungeon, suddenly hearing some noise at the back, turning back, a big zombie face is filling the screen........I'm playing in first person.

Random bandits.
Great sniping fun.

I hate those mofos!

Ash Vampire.

Something about that mask just makes you want to boogie.

Excuse me, but I believe Saint Jiub has that honour...

I think the best fight I had was killing the Hands of Almalexia. I killed one stealthily and then taking on the other four was...not easy...

For me, it'd probably have to be the dreughs. Their wax was fairly valuable.