I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

What is the centre of gravity?

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

Why is it very easy to weigh a fish?

An artist while painting a scenic beauty, decides to paint three layers of blue colour on the sky.

Which layer will go on the first?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

What has many teeth, but cannot bite?

Why is Saturday stronger than Monday?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?