Finally the lights lowered and the projector began to roll. The audience hushed as my new Charlie Chaplin film began. It showed the credit titles to the usual first night applause. Then at last the first scene opened. My heart pounded. It was a comedy scene of the unveiling of a statue. They began to laugh! The laughter, hesitant at first, increased. I had captured their emotions. All my doubts and fears began to melt away. And I wanted to weep. For three reels they laughed. And from sheer nerves and excitement I was laughing with them. All in all, the picture went well. During the final scene I noticed Einstein wiping his eyes. To me it was further evidence that scientists are incurably sentimental.

Q. Underline two sentences which show that the tone of the film was humorous.