What has many keys but can’t open a single lock?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

Wednesday, Steve and Pam go to a restaurant to eat lunch. After eating lunch, they pay the bill. But Steve and Pam do not pay the bill. So…who does?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

If eleven plus two equals one, what does nine plus five equal?

Keyboard words are not in alphabetical order, Why?

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

What month of the year has 28 days?