如果你明白作者用”shoot and leaves"的意思你就懂得这个笑话了，在笑话的后面我会附上它的英文解释：

A panda walks into a cafe. He orders a sandwich, eats it, then draws a gun and fires two shots in the air.

"Why?" asks the confused waiter, as the panda makes towards the exit.

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."

【作文地带的注解】

The meaning of shoot in the manual means "a part of bamboo" and leaves mean "a green part of tree" but panda misunderstood the meaning.