What always comes into a house through the keyhole?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

What part of Turkey has the most feathers?

What word begins and ends with an E, but has only one letter?

Replace the question mark in the picture below.

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

I am a mother. However, I never give birth.

I am a father. However, I never nurse my children.

Wandering is not possible for me, but standing still happens occurs rarely.

Who am I?

A man is found dead with a knife in his back When the investigation is done. A chair lays beside him and the forensic team finds moisture around the body.

If he committed suicide, how did he do it?

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

Forwards I am heavy, backward I am not. What am I?