To continue RAP's theme, how about the shot it took you hours to get, getting up at 3 am, driving 3 or 4 hours. Setting the camera, everything goes without a hitch. You come back home and you mess up the negative developing it. To me this is thw worst! You get to see the wonderful shot right there, and know you cant print it. How do I know?..I am looking at a beautiful 12x20 landscape where I have uneven developing....stupid me tried to develope 3 negatives at the time instead of my usual brush developing....serves me right for being lazy!