What begins with T, ends with T, and has T in it?

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?

Who is that with a neck and no head, two arms and no hands? What is it?

Take number 1000 and then add 20 to it.
Now add 1000 one more time.
Now add 30.
Now add 1000 one more time.
Now add 40.
Now add 1000 one more time.
Now add 10.

What is the total?

When is the top of a mountain similar to a savings account?

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

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

What kind of band never plays music?

how come the second man dies?

How can a man go eight days without sleep?