this be the most unrealistic movie i ever see . i can not believe that the writer and director do not see that almost all the movie look like a sf one . for example represent 1. it be impossible for the killer to stay on cold glaze and after 10 hour to get up so quickly . 2. you can not get electrocute trough a water pipe like in the movie . ( believe me and it my domain ) 3. with a saw you can cut 10 pipe in 10 hour very easy . let say that the chain be make from steel but the water pipe be rusty and it be make from iron . 4. if you try to cut your foot with a saw you faint ( in the best case and it more likely to die because your hart fail ) before to get to the bone ( shin ) . and there be more other example .