On the importance of correct punctuation

Today I read this on legal writing, and it includes this story on punctuation:

A panda walks in to a café. He orders a sandwich and eats it, then draws a gun and fires two shots in the air. “Why?” asks the confused waiter. As the panda exits, the panda produces a badly punctuated wildlife manual and tosses it over his shoulder. “I’m a panda,” he says, at the door. “Look it up.” The waiter turns to the relevant entry and, sure enough, finds an explanation. “PANDA. Large black-and-white bear-like mammal, native to China. Eats, shoots and leaves.”