Rivkah goes to "Heshy the Kosher Butcher" to buy her weekly portion of chicken. After looking at all the packs of chicken on display, she goes over to Heshy and asks him, "Heshy, I'd like to know how you feed your chickens."
"Nu? So why do you want to know this information?" asks Heshy.
"Because,” answered Rivkah, “I would also like to be as thin and scrawny as your chickens.”