Conducting business bilingually

The organization for which I work employs enough people from the Former Soviet Union that I’d hazard a guess that some 10% of all conversations in our various offices take place in Russian. Recently, in a co-worker’s office, I was privy to a lengthy phone conversation in Russian, interrupted by the statement, in English, “I can explain this in two languages,” and an immediate return to Russian. It was all I could do to keep from cracking up on the spot. :)