Nurse Martha

Two doctors were in a hospital hallway one day complaining about Nurse Martha. "She's very dumb - she does everything absolutely backwards," said one doctor. "Just last week, I told her to give a patient 2ml of potklor every 10 hours - she gave him 10 ml every 2 hours and he nearly died on us!"
The second doctor said, "That's nothing, earlier this week I told her to give a patient an enema every 24 hours - she tried to give him 24 enemas in one hour, the poor the lady nearly exploded!"
Suddenly, they hear a blood-curdling scream from down the hall, "Oh my God," said the first doctor...
"I just realized I told Nurse Martha to prick Mr. Smith's boil!"