Where should I start Terry Pratchett's Dicworld from?

Terry Pratchett was an electrical engineer when he began his discworld series so the first one was slightly gaga, when it took off and he gave up the day job and started spitting out a book once a year or so, they all stand alone but there is a continuity about them that extends to the characters and the nature of the discworld in general. My humble suggestion is that you start from the start. Suffer through the first one and laugh your life away or giggle it away through the rest of them. You can download the entire series for free from VUZE , hope you enjoy them as much as I have. I'm re-reading them on rainy days.lol