What does this rebus mean?

O
N
C
E
TIME

Why did Buffon take the goal with him after every Juventus match?

What kind of band never plays music?

What is the next number in this matchsticks series riddle?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

What question can you never answer yes to?

Before the start of the car race, John and Jacob have the same amount of fuel in their car. With this fuel, John can drive for 4 hours while Jacob can drive five hours.
After a time they realize that the amount of fuel left in John's car is 1/4th of the fuel in Jacob's.

For how long they are racing?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

What building has the most stories?

I am not a bull but I have horns.
I am not an ass but I have a pack saddle.
Wherever I go, I leave silver behind me.

Who am I?