Back in my younger days I had a Prof who had been a "Captain of His most Imperial Majesty Czar Nicolas II's Artillery" (this is how he would always introduce himself). This gentleman spoke several languages and had had quite an interesting life. Served in the Imperial Russian Army, White Russian Army, French Foreign Legion, and Yugoslavian partisan (WW2). He was a very old man when I had his class (Humanities) and we would be continually calling out "auf Englisch, bitte". As he was continually change his presentation language mid sentence.
I can handle 4 languages, all of them poorly.