The elevator scene in Attack of the Clones is pretty bad. It has by far the laziest writing in the saga. During re-shoots George probably realized that Obi-Wan and Anakin hated each-other, so he thought that that one scene should even it out.
JEDIT: It’s not the worst, though. I think the worst part of the prequels is when the pack animal farts in Jar-Jar’s face.