Answer:
If you have me, you want to tell me. If you tell me, you don't have me.
What do cheetas, dalmatians and appaloosas have in common?
It has the biggest wall and is also used when drinking tea.
I shave several times a day, yet I still have a beard. Who am I?
I am the red tongue of the earth, that buries cities.
What sphinxes employ and players enjoy.