There were two beggars sitting side by side on a street in Mexico City. One had a Christian cross in front of him, the other one the Star of David.
Many people went by, looked at both beggars, but only put money into the hat of the one sitting behind the cross. A priest came by, stopped, and watched many, many people give money to the beggar behind the cross, but not to the beggar behind the Star of David.
Finally he went over to the beggar behind the Star of David and said, "Don’t you understand? This is a Catholic country. People aren’t going to give you money if you sit there with a Star of David in front of you, especially when you’re sitting beside a beggar who has a cross."
The Star of David beggar listened to the priest and, turning to the Christian cross beggar, said: "Moishe…look who’s trying to teach us marketing."