Why is a river so rich ?

Outside a massage parlour, there is a board that reads
"I only massage those who do not massage themselves."

Reading the above statement, does the masseur massage himself?

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

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.

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 are the happiest people in IPL match?

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

What seven-letter word has hundreds of letters in it?

Do you know who was buried in John's tomb?

When we see 2 but call 10?