Blind Corner

Mali and Lali were chatting over coffee.

Mali said, "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."

Mali then took a sip of her coffee from the cup, "Owwwww!" she screamed. "There it goes again!"

So observing Lali said, "Mali, take the spoon out of the cup."