i always say, "ARE YOU GOING TO DO IT FOR ME?" and then i let them know that i have to be up for either work or school at 6:15 a.m. and that they will have to straighten it every day since its so curly.
i actually had 1 person try. and she failed. needless to say, she didnt make another comment about straightening my hair ever again. and thats when i had a realxer!!! (ive got super curly hair)