A dietician is lecturing an audience.
"The food we eat is enough to have killed most of us years ago," he says.
"Red meat is dangerouse. Vegetables are often sprayed with pesticides, and our drinking water is frequently polluted. However there is one food stuff far more dangerous than all of them combined. Who can tell me what it is?"
There"s a long pause, then a man in the front row sticks his hand up and says........
"Wedding cake?"