bacho k doubt

bacho k doubt:
bablu:teacher bus male hai ya female?
teacher:sochne lagi.
pappu-teacher it's female.
bablu-kyu?
pappu-kyu ki sab log uspe chadte hai.
teacher pareshan while
bablu in doubt-agar bus female hai aur sab uspe chadte hai to uske bache kyu nahi hote?
teacher aur pareshan....
pappu-kyu ki sab us par peeche se chadte hai.
teacher sharm se pani pani.
bablu in doubt-mana sabhi peeche se chadte hai,but driver aur counductor to aagay se chadte hai.phir bache kyu nahi hote?
teacher ki saanse band.
pappu-kyu ki woh dono topi phen ke chadte hai.
teacher behosh***