Anakin and Count Dooku
When Anakin and Obi-Wan face Dooku on The Invisible Hand, Obi-Wan says "This time we will do it together." As they fight Dooku says "I've been looking forward to this." Anakin responds with "My powers have doubled since the last time we met Count,." "Good," he responds "Twice the pride, double the fall.
Now we have the Clone Wars, in which Anakin duels the Count 6 more times! Once on Tatooine, twice on Naboo, one when Anakin only had a whip on Zygerria, with Obi-Wan on Obah Diah and finally a duel took place on a ship in Dark Disciple. The point is, how can they explain that dialogue in Episode III, that acts as if they haven't dueled since Geonosis, and please nobody say it was because Clone Wars was made 3 years after ROTS. I want a possible in-universe explanation for this.