The professor goes to the university canteen for lunch, a student sits across from him at the same table. The professor gets annoyed with him and said: "A pig and bird do not eat together".
Student: "I apologize. Then I'll fly to another table". The professor is very frustrated about the student's astute answer and decides to get the student back on the next exam.
But during the exam, the student answers all the questions correctly and again the professor must swallow his frustration. During an oral test, the professor asks: "There are 2 bags in the street. One is full of money and the other full of intelligence. Which one do you choose?"
Student: "The bag of money."
Professor: "I think the bag with intelligence would have been better."
Student: "I know. People always choose what they don't have."