What can be opened but can't b...

Ben went on safari with his wife and mother-in-law. One evening, while still deep in the jungle, the Mrs. awoke to find her mother gone. Rushing to her husband, she insisted on them both trying to find her mother.
Ben picked up his rifle, took a swig of whiskey, and started to look for her. In a clearing not far from the camp, they came upon a chilling sight: the mother-in-law was backed up against a thick, impenetrable bush, and a large male lion stood facing her.
The wife said, "What are we going to do?"
"Nothing," said Ben, "The lion got himself into this mess, let him get himself out of it."