Answer:
Which fish costs the most?
What does a fish say when it runs into a concrete wall?
What is the difference between a car and toilet paper?
I have one, you have one. If you remove the first letter, a bit remains. If you remove the second, bit still remains. If you remove the third, it still remains.
Have you heard about the restaurant on the moon?
What never gets any wetter no matter how hard it rains?