Why is a pencil like a riddle? ...Because it's not any good when it's pointless.
Why does a dragon sleep all day?..So it can hunt knights
What gets it's head at night then looses it in the morning?...A pillow
What gets wetter and wetter the more it dries?..A towel
What has holes but can carry water?...A sponge
What is black in the beginning, red when you use it and grey when you throw it away?..A lump of coal