Answer:
Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?
You speak this when you are being sincere.
What starts with a P, ends with an E and has a million letters in it?
What never gets any wetter no matter how hard it rains?
What cleans as it gets dirty only to get clean the more you use it?
When is it bad luck to see a black cat?