The bilingual must eventually ask "do you understand this?"

When the bilingual speaker observes an anglophone listening, he or she will ask "do you understand this" in English. The probability quickly approaches 100%. Few make it past one minute.

It's not even a real question. What can you say: yes, completely; no — or the real answer, which is complex and kills the moment. When somebody's trying to understand another language, It's a rude question.