I walked with a friend to the newsstand[书报摊，报刊亭] the other night, and he bought a
paper, thanking the owner politely. The owner, however, did not even acknowledge it.
“A sullen[阴沉的] fellow, isn't he?” I commented as we walked away.
“Oh, he's that way every night,” shrugged[耸肩] my friend.
“Then why do you continue being so polite to him?” I asked.
And my friend replied, “Why should I let him determine how I'm going to act?”