Answer:
I will disappear every time you say my name.
I am three simple words everyone wants to hear. Three simple words such simple words and yet...life changing...
The Titanic is still here.
I am a precious stone, as clear as a diamond. Though you can walk on water with my power, try to keep me, and I'll vanish in an hour. What am I?
I have three feet but I cannot walk. What am I?
What is always coming but never arrives?