Can you replace the question mark with the correct number in the below table sequence?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

What time is it when an elephant sits on a fence?

During which month do people sleep the least?

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

Can you spot the man between the coffee bean in the picture below ?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?