student and funny answers

Teacher said the students to convert the sentence ( I killed a person ) into future tense.

Suddenly ; a student stands up and said: 

Sir the future tense is ; you will go to jail.

teacher asked a student : When is it bad luck to see a black cat?

student answered : When you have a mouse

 teacher :Which is the strongest animal?

student : A snail.

teacher : why?

student : because He always carries his house on his back .