Different lights make me strange by changing me into different sizes. What am I?

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?

Consider this: Arnold Schwarzenegger has a big one. Michael J. Fox has a small one. Prince doesn’t have one. The Pope has one but never uses it. Bill Clinton has one and uses it all the time. What is it?

If Japan and Panama decided to merge into a single country, probably people will name it Japanama.

Can you think of two more such country's unions that could produce similar names like Japanama by overlapping their three letters?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

He loves to dance, twist and prance, he shakes his tail, and as a way he sails, wingless he flies into the sky. What is he?

What can you hold in your right hand, but never in your left hand?

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

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

Prove that the below maths equation is true.

8 + 8 = 91