Ewan McGregor used to be a functioning alcoholic, arriving sometimes drunk on set and even continuing to drink between takes. This made him unhappy, so he gave up alcohol in 2001 and hasn’t touch alcohol since.
When filming in Star Wars: Episode I – The Phantom Menace, Ewan McGregor kept imitating the noise of the lightsaber during his fights. George Lucas explained many times that this would be added in by the special effects people later on. Ewan said “I keep getting carried away“.