Audition on Saturday!?

please help...my son has an audition on Saturday and he needs a monologue 1- 2 min max. please no huck finn or Shakespeare. there isn't enough time to memorize all that and teach him the different ways of talking. he is 12. he needs something thats going to bring out his funny side or his sarcastic side of acting. this is very time sensitive so please answer quickly. thank you.