How can you write nineteen in a manner that if we take out one, it becomes twenty?

How many words can a pen with half refill write?

Who has married many women but was never married?

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

Take away the whole and some still remain. What is it?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

There are 3 apples in the basket and you take away 2. How many apples do you have now?

Why do you find that most of the buildings are deprived of the 13th floor?

Can you name an animal whose killing cannot be performed without spilling your own blood?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?