1) Principal: R u chewing gum?
Student: No i m human being :)
2) Wife: V r having mother 4 dinner 2nite?
Husband: Make sure she is well cooked :p
3) Father:shameful results! Do u alwayz get such low marks?
Son: No, only when i give exams ;)
4) Guest: Will these stairs take me to d 2nd floor?
Boy: No, u'll have to walk as well :)
And finally my fav one...
5) Girl: I have changed my mind.
Boy: Thank God! Does the new one work? :p