A business man called a travel agent and had a question about the documents he needed in order to fly to China. After a lengthy discussion about passports, the travel agent reminded him he needed a visa.
"Oh, no, I don't. I've been to China many times and never had to have one of those."
The travel agent double checked, and sure enough, his stay required a visa. When the travel agent told him this he said, "Look, I've been to China four times and everytime they have accepted my American Express or MasterCard."