There has to be a way to incorporate this scene...
http://www.youtube.com/watch?v=-UGPLmox8WQ
Ewan's and Natalie's reaction to Threepio falling over in the blooper reel might be useful.
http://www.youtube.com/watch?v=TtTWwiy6IGI
The deleted scene with Grevious, where Obi Wan and Anakin exchange secret signals is potential comedy gold as well.