Task: Question Answering
Input (English): Last night I was watching one of my favourite musicals - Fiddler on the roof . It was probably on the 3rd time I watched the movie and it has probably been at least 5 years . So I'm watching this great film and the papa starts to sing " If I were a wealthy man ba da ba da ba ... " and I sat there having a total deja vu . Why do I know this song ? 
Question: Why does this person watch the same movie again and again ?
Output (English): The feeling of nostalgia , the movie brings back memories .