Little Mary: I find in my history book there is always such number (1451--1560) after the name Christopher Columbus. Would you please explain why, sir?
Little Rose: I can tell her, sir. It was Columbus's telephone number.
2. 石油
Teacher: What do we do with crude oil?
Pupil: Teach it some manners!
3. 交换三明治
Two attorneys went into a diner and ordered two drinks. Then they took out sandwiches from their briefcases and started to eat.
The waiter became quite concerned and marched over and told them,“You can’t eat your own sandwiches here!”The attorneys looked at each other, shrugged their shoulders and then exchanged sandwiches.