For Boba Fetts death, removing the goofy scream he makes when he’s hurtling through the air is a good place to start.
http://www.youtube.com/watch?v=v4xKHWQckfI&t=0m34s
Also, if you listen closely before he hurtles through the air you’ll hear “What the…?” is said in the same voice as the scream; not Jeremy Bullochs voice.