Interesting idea. Many years ago when I was learning French I seemed to speak it much better after a drink or two with a French speaking neighbor. Maybe it was less worry over grammar though I can't say I felt nervous speaking to them when sober - my communication just seemed faster and smoother with a drink.
Outside academia, I once played in a band where the singer got nervous before every show. Things went a lot better once we persuaded her to start having a drink (one drink) before going onstage.
I always go into a performance or an interview fine but then have a panic halfway through. The trick is to recover from that and keep things moving.