Quote from : Star Wars: Episode III - Revenge of the Sith Movie

Anakin Skywalker: Ray shields.
Obi-Wan: Wait a minute. How did this happen? We're smarter than this.
Anakin Skywalker: Apparently not. I say patience.
Obi-Wan: Patience?
Anakin Skywalker: Yes. R2 will be along in a few moments and then... he'll release us from the ray shields.
[R2 comes skidding across the hallway and bashes into the opposite wall]
Anakin Skywalker: See? No problem.