I knew someone who went hiking in Northern California. He was having problems with hay fever and his eyes were very itchy so he grabbed a leaf and rubbed it on

I knew someone who went hiking in Northern California. He was having problems with hay fever and his eyes were very itchy so he grabbed a leaf and rubbed it on his eyes. It felt good initially but then began itching and burning and his eyelids swelled up so he couldn’t see. It turns out he had grabbed poison oak leaves (a relative of poison ivy) and rubbed them on his eyes. It was not a fun time.