what does this picture(rebus) riddle means ?

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

Solve the riddle below:

If a Chicken says, 'All chickens are liars" is the chicken telling the truth?

What's the best place to go shopping in the ocean?

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?

Imagine you are in a room with no windows or doors. How will you get out?

In one of the popular batman series movie "Batman Forever", there was a riddle that goes like "Tear me off and then scratch my head and I was red then and now I am back. Who am I?

I am sure no one can have two things for dinner. what are they?

What do you get if you add 2 to 100 four times?

There are three houses in a straight row. One is red, one is blue, and one is white. The red house is left of the middle. The blue house is right of the middle. Where's the white house?