One day, Pam's cousin came to meet her at school. After talking to him she returned to the class. At that time, the teacher was writing something on the blackboard. Pam didn't say anything and quietly went inside the classroom and sat down on her seat.
After writing, the teacher went to Pam and asked her, "Who was he?" Pam replied with fear, "He was my cousin brother." The teacher again asked the question and Pam gave the same answer.
The teacher then shouted, "I am asking who was Galileo." The whole class burst into laughter when they came to know that both teacher and Pam had misunderstood each other.