Joke...burning building?

THere was a blonde a brunett and a red head on top of a burning building. The firemen were standing at the bottom of the building with a sheet and they yelled to the brunett "jump and we will catch you' so she jumped and the firemen moved the sheet and she went flat on the ground. THey then said to the red head 'its your turn now jump and we'll catch you' she replied 'im not stupid i saw what you did to her' they replied 'no we just dont like red heads' so she jumped and they moved the sheet and she went splat on the ground. They then said to the blonde 'its your turn now' she said 'im not stupid i saw what you did to the other two, just put the sheet down and walk away'