When 99 is considered higher than 100?

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?

After teaching his class all about Roman numerals (X = 10, IX=9 and so on) the teacher asked his class to draw a single continuous line and turn IX into 6. The teacher's only stipulation was that the pen could not be lifted from the paper until the line was complete.

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

What is the riddle which can be asked all day with a different correct answer each time.

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

If eleven plus two equals one, what does nine plus five equal?