Money may not grow on trees, but giant pinecones sure do. One man is filing a $5 million lawsuit against multiple government entities for injuries he sustained after a 16-pound pinecone allegedly "crushed his skull."

Sean Mace, a Navy veteran is suing the U.S. government, the National Park Service, the Department of the Interior, and San Francisco Maritime National Historical Park for $5 million, SF Gate reported. The 51-year-old was in the San Francisco Maritime National Historical Park to watch the Blue Angels air show when a 16-pound pinecone "crushed his skull," Scott Johnson, Mace's lawyer, said.

Johnson claimed on Monday that Mace has suffered "an irreversible brain injury." His injury is so severe that he's had two surgeries to relieve pressure from his brain due to internal bleeding, and will need another for unspecified reasons, Johnson said.

According to SF Gate, the tree that produced the pinecone is commonly known as the Bunya Pine and not indigenous to the area. The trees are thought to have been planted by park staff years ago. Bunya pinecones can weigh up to 40 pounds, so they may cause considerable damage. After the incident, park services erected orange plastic fences around the grove of Bunya Pines with warning signs that read: “Danger: Giant seed pod falling from tree.”