What occurs twice in a week, once in a year but never in a day?

What number do you get when you multiply all of the numbers on a telephone's number pad?

That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?

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.

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

Can you circle exactly four of these numbers such that the total is twelve?

1 6 1
6 1 6
1 6 1
6 1 6

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

A man was gazing through the window of the 23rd floor of the building. He suddenly opened the window and jumped on the other side of the window. On landing on the floor, there was not a sheer mark of injury on him.

How can that be possible if he did not use any kind of parachute and did not land on a soft surface?

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?