A dude went into the drug store and asked to buy a rubber. The clerk told him he doesn't sell rubbers one at a time, he only sells packages of 6, 8 or 12. The dude asks why. The clerk said, "Well I don't make any money off these things but I carry them for my regular customers any way and that's how they buy them." The dude asks, "But why 6, 8 or 12?" The clerk said, "Well, those packs of six are for my Mexican customers. You know they do it six days a week and rest on the Sabbath." He asked, "What about the pack of eight?" The clerk said, "For my Black customers. You know they do it seven days a week and twice on Sunday." He asked, "And the packs of twelve?" The clerk said, "That's for my white customers. You know, January, February, March, ..................