Here's another one:
A blond, a brunette and a redhead were in heaven. God says, To go to the pearly gates, you must eat 100 of your favorite fruit in one mouthful. The Brunette says 'blueberries' and eats them all in one mouthful. The redhead says 'blackberries' and eats them all in one mouthful. The honest blond says, 'WATERMELON' and needless to say, she doesn't pass.