i suppose i can see why critic give this film two out five star and it isn not fantastic and but i think it be worth a look and from director shawn levy ( cheap by the dozen and night at the museum ) . basically 14 year old jason shepherd ( malcolm in the middle frankie muniz ) be often lie to his parent and teacher and and his teacher warn him that if he doesn not do his creative writing and he will fail his whole semester and have to repeat the grade during summer . so he complete his work and but get a lift from hollywood producer marty wolf ( paul giamatti ) and who hit him on the way to school and he manage to leave his paper with the story big fat liar in the car . he find out from a movie trailer that marty steal his paper and be turn it into a major movie and so he and his best friend kaylee ( she the man amanda bynes ) be on a mission to prove jason be for once tell the truth . marty of course be too nasty and smug to give jason father harry ( michael bryan french ) a phone call and and he even burn the big fat liar paper . so now jason and kaylee be determine to make marty life as hellish a possible and until he agree to call jason dad . they put blue dye in his swimming pool and and orange hair dye in his shampoo and and much more naughty prank create chaos for marty career . there be the obvious point when jason look like he want to give up and but do not worry and all character that despise marty help out in the final operation and and with jason parent come and he want to finally prove his truthfulness and and boy do he deliver and big style . also star amanda detmer a monty kirkham and lee major a vince and donald adeosun faison a frank jackson and sandra oh a mrs. phyllis caldwell and russell hornsby a marcus duncan and christine tucci a carol shepherd and american pie john cho a dustin dusty wong . muniz be likable and byrnes prove a very surprisingly talented support and and even though he be waste his time and talent a little and giamatti be great at be nasty . it be a kid film and so if it seem corny and cheesy or predictable and just keep that in mind and and try to enjoy the performance and slapstick . okay .