Related:

• He thought he saw an Elephant, That practiced on a fife
  He looked again, and found it was A letter from his wife....
• He thought he saw a Banker's Clerk Descending from the bu
  He looked again, and found it was A Hippopotamu...
• He thought he saw a Buffalo Upon the chimney-piece
  He looked again, and found it was His sister's husband's niece....
• Yes, let's consider," said Bruno, putting his thumb into his mouth again, and sitting down upon a dead mouse.
  "What do you keep that mouse for?" I said. "You should either bury it or else throw it into the brook....
• He thought he saw an albatross That fluttered 'round the lamp.
  He looked again and saw it was A penny postage stamp....
• England no longer existed. He'd got that--somehow he'd got it.
  He tried again. America, he thought, has gone....