Greenberg is sitting in a bar. He goes up to Woo, a Chinese gentleman, and punches him.
"Why'd you do that?" cries Woo.
"Because of Pearl Harbor," snarls Greenberg.
"But I had nothing to do with Pearl Harbor, I'm Chinese!" says Woo.
"Chinese, Japanese, it's all the same to me," answers Greenberg.
A month later, Greenberg sees Woo in the bar and apologizes to him. The Chinese gentleman smiles, then punches Greenberg.
"Why did you do that?" cries Greenberg?
"Because of the Titanic."
"What do I have to do with the Titanic?" asks Greenberg.
"Greenberg, iceberg, it's all the same to me."