Star Wars: Clone Wars2003

Count Dooku/Darth Tyrannus:
You are more powerful than I have sensed.

Asajj Ventress:
The Dark Side is strong in me, for I am Sith.

Count Dooku/Darth Tyrannus:
Ha, ha, ha! A bold claim. But you are not Sith.

[Dooku floats down using the force and stands before Ventress]

Count Dooku/Darth Tyrannus:
You wear the trappings of the Sith, you fight like the Sith. But this can be imitated, however. You lack a vital quality found in all Sith. Sith have no fear. And I sense much fear in you.

Asajj Ventress:
You are a foolish old man who knows nothing of the Dark side!

[ignites her lightsabers]

Count Dooku/Darth Tyrannus:
[chuckling] Indeed?

[She charges, and he shocks her into unconsciousness with Sith lightning]