John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?

But it is quite possible, do you know how?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

I can write cow in 13 letters.

Can You?

How many times do a clock's hands overlap in a day ?

I am an odd number. Take away a letter and I become even. What number am I?

What's the only room from which no one can enter or leave