A little girl visited Yosemite. Later, she wrote back to the park and told them she knew she wasn't supposed to take these from the park, and to please put back into nature what she took: 2 small twigs which were taped to the letter.
We laugh, but she's right.
http://www.huffingtonpost.com/2013/02/27/kid-writes-letter-to-yosemite-national-park_n_2775343.html