John is the son of Jacob.
So,
Jacob is the_____of John's father?

Why do people go to bed?

You are on a Boat in the mid of a river. You have two cigarettes with you. One of these two you have to light, how will you light the cigarette?

Take number 1000 and then add 20 to it.
Now add 1000 one more time.
Now add 30.
Now add 1000 one more time.
Now add 40.
Now add 1000 one more time.
Now add 10.

What is the total?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

How can you tell a raw egg from a hard-boiled egg?

What type of tree can I carry in my hand?

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

Who can jump higher than a Mountain?

What has no start, end, or centre?