There was a student who was desirous of taking admission for a study course.
He was smart enough to get through the written test, a GD and was to appear for the personal interview. Later, as the interview progressed, the interviewer found this boy to be bright since he could answer all the questions correctly. The interviewer got impatient and decided to corner the boy.
"Tell me your choice;" said he to the boy, "What's your choice: I shall either ask you ten easy questions or ONE real difficult. Think well before you make up your mind."
The boy thought for a while and said, "My choice is ONE real difficult question."
"Well, good luck to you, you have made your own choice!" said the man on the opposite side. Tell me: What comes first, Day or Night?"
The boy was jolted first but he waited for a while and said: "It's the DAY, sir."
"How???????" the interviewer was smiling ("At last, I got you!" he said to himself.)
"Sorry sir, you promised me that you will not ask me a SECOND difficult question!"
Admission for the course was thus secured.