Listen to the story of Columbus Egg. I said 'listen', as the YouTube video comes complete with subtitles, so if you 'watch' it first, you'll be letting the cat out of the bag and will be unable to put your listening ability to the test.
So listen to the story of Columbus Egg once or twice. After that, watch the video to work out whatever problems may have come up.
Finally, get together with an English-speaking friend or record yourself retelling the story.