Doctor: "I'm afraid I have some good news and some bad news, Miss Hottwot". Miss Hottwot said "Well, give me the good news first, Doc". Doctor, speaking rather sombrely, said "Your lab tests came back today, and your crabs are all gone". Miss Hottwot smiled, and said "Gee, that's great! But what's the bad news?" Doctor: "We don't know what killed them".