What always comes into a house through the keyhole?

Can you count the number of quadrilaterals in the picture below?

John and Jenni are a married couple. They have two kids, one of them is a girl. Assume safely that the probability of each gender is 1/2.
What is the probability that the other kid is also a girl?

Hint: It is not 1/2 as you would first think.

Count the squares in the matchstick puzzle below?

How can I get the answer 24 by only using the numbers 8,8,3,3?

You can use the main signs add, subtract multiply and divide.

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

Can you place six matchsticks in a manner that each of the matchsticks is in touch with the other five matchsticks?

A woman shoots her husband.

Then she holds him under water for over 5 minutes.

Finally, she hangs him.

But 5 minutes later they both go out together and enjoy a wonderful dinner together.

How can this be?

How can you take 2 from 5 and leave 4?

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?