When Down Means Forward
Yes, walking the marathon-esque distance between Air France's international and domestic terminals in Paris meant figuring out pretty quickly that if an arrow pointed down, I was not supposed to take any stairs or even the elevator placed right next to the sign. Instead I was meant to walk forward.
In this case of cross culture mix up not even a visual dictionary could have helped. Simply put, it was a (sign) language barrier overcome only by trial and error.