the oldest joke

I have a whole week till I get my food stamps. I have to eat whatever I can find till then. All I could find today was butter. I think they might be trying to give me a heart attack by feeding me butter. They might think it was funny because I went around drawing broken hearts.
I tried to think of a comeback. The fist thing that popped in my head was lots wife. Why a pillar of salt? Then I realized that  the people in the old days must have seen their livestock licking salt just like farmers  use the salt todayfor their cattle.