Linda (a blonde) and Jill were chatting over coffee. Said Linda, "I've been experiencing a strange and painful side effect from coffee. I'm fine when I drink it black, but if I use cream, or sugar, or both, I get a stabbing pain in one eye." Linda took a sip of her coffee. "Owwwww!" she cried. "There it goes again!"
Said Jill, "Linda... take the stir-stick out of the cup."