Gun sounds
It would appear that Ewan McGregor was not the only actor on the Star Wars set that was accustomed to making noises when he used his fake weapon. Laura Dern would say ‘pew pew’ every single time she shot from her laser gun. It seems like there is a child still stuck in all of us.
If you go back and watch the movie she makes an appearance in, you can see her moving her mouth around each time she shoots the gun. We do not really know why she insisted on doing this, perhaps just to add to the realism, but it’s a funny little fun fact.