This thread seems like a good argument for the recorded safety briefings done on the drop down screens, even if you don't understand the language they are visually designed for you to understand.
I was on a flight from Baku to Vienna earlier this week and the language difficulties were very apparent, this coupled with the fact that most of the passengers were Azeri and weren't frequent travellers made it even more difficult. The crew began their landing procedures a full 10 minutes before they usually did. Every other passenger had to be asked to stow their table, straigten their seat or open their window shade and none of them spoke english or german. Quite a difficult flight for the crew.