Teacher's punishment

Teacher and her 3 boy students: Teacher: “Why did you laugh?” Boy 1: “I saw a strap of your bra.” Teacher: “You are punished to stay out of school for one week.” Boy 2 laughed… Teacher: “Why did you laugh?” Boy 2: “I saw your bra straps.” Teacher: “You are punished to stay out of school for one month.” Teacher bent down to pickup a chalk. Boy 3 started walking out of the class… Teacher: “Why are you leaving?” Boy 3: “I think my school days are over.”