After a while, exhausted and drained, Harry found himself sitting on a bench beside Luna.
“I’d want some peace and quiet, if it were me,” she said.
“I’d love some,” he replied.
“I’ll distract them all,” she said. “Use your cloak.”
And before he could say a word she had cried, “Oooh, look, a Blibbering Humdinger!” and pointed out of the window. Everyone who heard looked around, and Harry slid the Cloak up over himself, and got to his feet.
Harry Potter and the Deathly Hallows – J.K. Rowling