Reminds me of a joke I heard this summer in Wyoming. A tour guide was giving recommendations for good restaurants. He had just recommended a steak house just down the street when someone asked if they served vegetarians. The guide replied, "Of course they do, all their steaks come from vegetarians." Good one!
I remember a joke where this married man and woman are in line at Burger King. The husband orders a Whopper, Large fries, and a large milkshake. The wife looks at him indignantly and askes, "what about your diet?" So the husband looks at the cashier and says, 'oh, yeah, and I'll have a salad to go along with that"