Can you find out who is the kidnapper in below Picture and why, Explain ?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

Can you find the key in the picture below?

Whats the next number in the below number sequence pattern.

What is wrong in the below Picture?

The centre of the third figure is empty. What digit should fit inside?

What is red and smells like blue paint?

What animal walks on four legs in the morning, two legs during the day, and three legs in the evening?

Oedipus, the king of Thebes, figured out the answer to the riddle:

My location can be determined by the below rebus.
So where am i ?

I organized a small get together at my home.
In the party , i have a barrel with some whiskey in it.

Suddenly Guest 1 say 'I bet this barrel of whiskey is more than half full'.
'No, it's less than half full' Guest 2 replied.

I don't have any measuring instrument and without removing whiskey from it , how can i determine which of the guest is right ?