"I can't believe that!" said Alice.
"Can't you?" the Queen said in a pitying tone.  "Try again: draw a long breath, and shut your eyes."
Alice laughed.  "There's no use trying," she said.  "one can't believe impossible things."
"I dare say you haven't had much practice," said the Queen.  "When I was your age, I always did it for half an hour a day.  Why, sometimes I've believed as many as six impossible things before before breakfast."
                      ~Alice Through the Looking Glass,  Lewis Carroll