To me odds are much more simpler, I do not believe in 1 out of a zillion chances, it's much more simpler:
50/50, either you win or not :)
Now on a serious note, I have been raised, way back when, to not speak while having dinner unless you are asked a direct question or asked to participate.
If I do not know someone I will never say "tu" and will be offended if I am addressed by using the "tu" "prononm".
However I have been frequently traveling to FR and was really surprised by the number of persons using "tu" right away, if I was (which I probably am) some sort of old "F..t" I will say that traditional education goes down to the drain.
Hmmm, kind of strange, where is this conversation going?
<edit> Reason: Typo, one I have seen among many I don't</edit>