As he was a great fan of his movies, he rushes over to him, and asks for his autograph.
Instead, Spielberg gives him a slap and says "You Chinese people bombed our Pearl Harbor, get out of here."
The astonished Chinese man replied "It was not the Chinese who bombed your Pearl Harbor, it was the Japanese". "Chinese, Japanese, Taiwanese, you're all the same," replied Spielberg.
The Chinese replies, "Iceberg, Spielberg, Carlsberg, you're all the same."
The author plays with the word "berg"
Autograph = Person's signature
Slap = Sharop hit with hand
Astonish = Sudden amazement
Sank = Past tense of sink means slow go down into water/ submerge
Forefather = Ancestor / family member in the old time
Some sources from http://www.thefreedictionary.com