In her amusing book Eats, Shoots & Leaves, Lynne Truss bemoans the problem of poor punctuation in today’s world. To illustrate, she tells the funny story of a panda who enters a café, orders a sandwich, eats it, and then pulls out a gun and starts shooting. When a waiter asks him to explain his behavior, the panda hands him a poorly punctuated wildlife guide and asks him to look up the description of a panda. It reads: “Panda. Large black-and-white bear-like mammal, native to China. Eats, shoots and leaves.”
Having a comma after the word eats is an error that changes the whole meaning of the last sentence. The words shoots and leaves become actions, instead of plants to eat.