Let's consider your age to begin with - how old are you?"

"I'm seven and a half exactly."

"You needn't say 'exactually,'" the Queen remarked: "I can believe it without that. Now I'll give you something to believe. I'm just one hundred and one, five months and a day."

"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 breakfast."
- Through the Looking Glass
by Lewis Carroll