今天有个英国人给我讲了这么一个笑话，这个笑话就写在下面。他说这个笑话非常好笑，可是我怎么也
听不明白什么意思，他说要英语到了一定水平才能听懂，有没有明白这个笑话的高人给指点一下？谢谢
A man orders chop suey in a restaurant. The waiter brings out a pot with a lid but the man's afraid to eat it because every so often the lid lifts up a wee bit and a wee pair of eyes peer out at him. He calls the waiter over, points it out, and asks "Are you sure that's chop suey?". The waiter goes, "Oh sorry sir, my mistake - I've brought you Peking duck."